Pears, Pomegranates, and the Temperate Others

TL;DR. Four fruits that share a temperate climate and little else. European pears are the only common fruit that must be ripened off the tree or it goes gritty and rotten from the inside out, which is why supermarket pears are so often either rock hard or brown mush. Pomegranate arils are the best-evidenced of the "superfruit" juices, with real trial data on blood pressure. Persimmons come in two types and eating the wrong one unripe is a genuinely memorable mistake. Quince is inedible raw and transforms completely on cooking.

1. What they are

The pomegranate is structurally unlike anything else in the produce aisle. What you eat are arils: individual seeds each wrapped in a translucent, juice-filled sac, packed several hundred to a fruit and separated by bitter white membrane.

2. Where they come from

Pear: two independent domestications. European pears from around the Caucasus and Asia Minor, cultivated since at least Roman times. Asian pears from China, cultivated for three thousand years or more.

Quince: the Caucasus and Iran. It predates the apple in Mediterranean cultivation, and there is a reasonable argument that many classical references to "apples," including the golden apples of Greek myth and possibly the fruit in the Garden of Eden narrative, described quinces. Marmalade takes its name from marmelo, the Portuguese for quince, and originally meant quince paste.

Pomegranate: Iran and northern India, cultivated for over 4,000 years, and one of the most symbolically loaded fruits in human culture: Persephone's pomegranate seeds in Greek myth, recurring imagery in Judaism, Christianity, Islam, and Zoroastrianism.

Persimmon: China, with Japanese and Korean selection producing most modern cultivars. The American persimmon (D. virginiana) is a separate, smaller species.

Production: pears roughly 25 million tonnes, with China producing about two thirds; pomegranates roughly 3 to 4 million tonnes, led by India, Iran, China, Turkey, and Spain; persimmons around 4 million tonnes, again China-dominated, with Korea, Japan, Azerbaijan, and Spain following. Spain's Rojo Brillante persimmon industry, using a post-harvest CO₂ treatment to remove astringency, expanded enormously in the 2010s and is why persimmons appeared in European supermarkets.

3. How they are grown

Pears are close to apples in cultivation: grafted, temperate, needing 600 to 1,000 chill hours, planted on dwarfing rootstocks (quince rootstock is standard for European pears and provides dwarfing, though it is incompatible with some varieties and requires an interstem). They are self-incompatible and need cross-pollination.

The defining disease is fire blight (Erwinia amylovora), a bacterium that kills shoots and whole trees rapidly and has no chemical cure; entire orchards are lost to it, and the visual is exactly what the name suggests. It is the main reason pear growing is difficult in humid climates and the reason resistant varieties are a priority.

Pears also have a distinctive fruit anatomy: stone cells (sclereids), clusters of lignified cells that produce the gritty texture near the core. Asian pears have many more, which is why they are crisp and slightly sandy rather than buttery.

Quince is an easy, hardy, small tree, self-fertile, largely untroubled except by fire blight, and grown in small quantities because almost nobody eats it raw.

Pomegranate is a drought-tolerant, salt-tolerant deciduous shrub or small tree suited to hot dry summers and cool winters, which is why it thrives across Iran, India, the Mediterranean, California, and Spain. It needs low humidity at ripening; rain causes the fruit to split, which is the main crop loss. It fruits from year 3, lives for decades, and is largely self-pollinating. Fruit is picked ripe (non-climacteric) and stores well for months at 5 °C.

Persimmon is a small deciduous tree needing 100 to 400 chill hours, tolerant of a range of soils, mostly self-fruitful, and remarkably free of pests. Many cultivars are parthenocarpic, producing seedless fruit without pollination.

4. What is inside them

Per 100 g raw:

Points worth noting:

• Pears are one of the higher-fibre common fruits, at 3.1 g per 100 g, and a medium pear delivers about 5.5 g. Most of it is in the skin.
• Pears are high in sorbitol, which is why they are a traditional remedy for constipation in children and why pear juice is a common cause of toddler diarrhoea when given in quantity.
• Persimmon is the carotenoid one, supplying a third of a day's vitamin A per 100 g, plus useful fibre.
• Pomegranate delivers fibre (from the seeds, if you eat them, which you should) and a substantial dose of punicalagins, ellagitannins that are converted by gut bacteria into urolithins, which are the compounds most of the research is actually about (Chapter 17).

5. What they do in your body

Pear sorbitol is poorly absorbed, draws water into the bowel osmotically, and is fermented. That makes pears mildly laxative, useful for constipation, and a reliable trigger for bloating in IBS. Pear is one of the highest-FODMAP fruits.

Pomegranate polyphenols are the interesting case. Punicalagins are large molecules, barely absorbed intact, and hydrolysed to ellagic acid, which colonic bacteria convert to urolithins. Only some people have the bacteria to do this efficiently, and urolithin producer status divides populations into roughly three metabotypes, which is a plausible explanation for inconsistent trial results.

Measured effects of pomegranate juice in human trials include modest reductions in systolic and diastolic blood pressure (meta-analyses find roughly 4 to 5 mmHg systolic), improvements in some markers of endothelial function, and, in a small and much-cited trial by Aviram and colleagues, reductions in carotid intima-media thickness over three years. That last study was small and industry-linked, and it has not been replicated at scale.

The prostate cancer story deserves care: an early single-arm trial reported slowed PSA doubling time, generating enormous interest, and the subsequent randomised, placebo-controlled trial found no significant difference. The company behind the leading pomegranate juice brand was subsequently found by the US Federal Trade Commission to have made deceptive health claims about heart disease, prostate cancer, and erectile dysfunction. It is a good illustration of how a promising early result becomes a marketing claim before the confirmatory trial arrives.

Persimmon tannins are the astringency, and they behave in a specific and important way, covered below.

6. What the evidence actually shows

Established: pears are a good fibre source and mildly laxative through sorbitol. Persimmon is a good provitamin A source.

Strong: the general whole-fruit association. Pomegranate juice lowers blood pressure modestly across multiple trials.

Mixed: pomegranate for endothelial function, exercise performance, and lipids, where trials are small and heterogeneous. Urolithin A supplements for mitochondrial function, which is an active research area with early human data.

Thin to refuted: pomegranate for prostate cancer (the randomised trial was negative) and for erectile dysfunction. Quince and medlar for anything specific.

7. Who should eat more, who should be careful

Good for: most people. Pears specifically for anyone raising fibre gently; pomegranate as a polyphenol-rich addition; persimmon as a vitamin A source.

Be careful if:

• IBS. Pears are among the highest-FODMAP fruits (excess fructose plus sorbitol) and are a frequent trigger. Persimmon in large portions is also high. Pomegranate is low-FODMAP in small portions.
• You take medication. Pomegranate juice inhibits CYP3A4, like grapefruit though less potently, and case reports describe raised INR with warfarin and interactions with statins. Evidence is weaker and less consistent than for grapefruit, and the sensible position is to mention regular pomegranate juice consumption to your pharmacist (Chapter 84).
• You have had abdominal surgery, gastroparesis, or reduced gut motility. This is the specific persimmon hazard and it is worth knowing.

The persimmon bezoar. Persimmon tannins polymerise in stomach acid into a sticky, insoluble mass that can bind with food and fibre to form a phytobezoar, a solid concretion in the stomach. Persimmon is the single most common cause of phytobezoar worldwide. Risk factors are eating large quantities of unripe or astringent persimmon, especially on an empty stomach, and having impaired gastric emptying (previous gastric surgery, diabetic gastroparesis, low stomach acid). Presentations range from nausea and pain to gastric outlet obstruction requiring endoscopic or surgical removal. Eating ripe, non-astringent persimmon in normal quantities is not a concern; this is a real but specific risk.

Ages. All fine from 6 months as soft or cooked pieces. Pomegranate arils are small and firm and should be supervised in toddlers. Pear purée and diluted pear juice have long been used for infant constipation and, given in excess, cause diarrhoea for the same reason.

8. When and how to eat them

Pears. Eat the skin, which holds most of the fibre and polyphenols. Ripe pears are excellent raw; underripe ones poach beautifully in wine or syrup. Pears pair with blue cheese for a reason that is partly chemical: the sweetness and acidity balance the salt and the strong volatile compounds.

Asian pears are eaten crisp and cold, like an apple, and never soften. Do not wait for them to ripen; they are ready when bought.

Quince must be cooked. Raw it is hard, astringent, and sour. Long slow cooking with sugar transforms it: the flesh turns from cream to deep pink or amber, and the flavour becomes intensely floral. It is extraordinarily high in pectin, which is why quince paste (membrillo, cotognata, dulce de membrillo) sets solid without added pectin, and why a quince added to an apple pie or jam improves the set. The aroma of a ripe quince in a room is one of the great under-known pleasures of fruit.

Pomegranate. The best deseeding method: score the skin around the equator and around the ridges, pull apart in sections, and either flick the arils out with a spoon over a bowl, or hold a half cut-side down over a bowl and strike the skin firmly with a wooden spoon. The underwater method (breaking it apart in a bowl of water so the membrane floats and the arils sink) works and is the least messy. Eat the seeds, not just the juice sacs: that is where the fibre is, and juicing discards it entirely.

Persimmon. This depends entirely on the type, and getting it wrong is memorable.

• Astringent types (Hachiya, and most traditional varieties) are acorn-shaped and packed with soluble tannins. Eaten firm they produce an extraordinary, furry, mouth-drying sensation that lasts many minutes and that nobody forgets. They must be eaten completely soft, to the point of looking spoiled, when the flesh is a sweet jelly you eat with a spoon. Freezing and thawing, or ripening with ethylene, also removes astringency by rendering the tannins insoluble.
• Non-astringent types (Fuyu, Jiro, Sharon fruit) are squat and tomato-shaped and can be eaten crisp like an apple, skin and all.

Sharon fruit is a Fuyu-type persimmon that has additionally been treated post-harvest with CO₂ to remove residual astringency; the name is a trademark from the Sharon plain in Israel.

9. Choosing, storing, and ripening

The pear problem. European pears are the one fruit that must be ripened off the tree. Left to ripen on the branch, they ripen from the inside out and the core turns brown and mealy before the outside is ready. So they are picked hard, chilled to break dormancy, and ripened at room temperature.

• Buy them hard. A pear that is soft in the shop is already past it.
• Ripen at room temperature for 3 to 7 days.
• Check the neck. The flesh at the very top, next to the stem, softens first. Press there with your thumb. If you wait until the body of the pear is soft, the inside is already mush. This is the single most useful pear fact.
• Refrigerate once ripe for a few days.
• Bartlett/Williams pears turn from green to yellow as they ripen; most other varieties give no colour signal at all.

Pomegranate: heavy for size, with a firm, slightly angular rather than perfectly round shape, which indicates arils pressing outward. Leathery skin is fine; the fruit keeps for weeks at room temperature and months in the fridge. Arils freeze well.

Persimmon: for Hachiya types, buy firm and wait, or buy already soft and use immediately. For Fuyu types, buy firm and eat firm.

Quince: hard and yellow, with a strong perfume. Keeps for weeks in a cool place, and will perfume the whole room.

10. The varieties worth knowing

European pears: Williams/Bartlett (the canning and juice pear; turns yellow when ripe), Conference (long, russeted, the British standard, holds shape when cooked), Comice (round, extremely juicy and buttery, the best eating pear), Anjou (green, holds firm), Bosc (russeted brown, dense, best for poaching), Concorde, Doyenné du Comice.

Asian pears: Nijisseiki (20th Century), Hosui, Shinseiki. Round, crisp, juicy, sold individually wrapped because they bruise easily. Called "apple pears," which is a description rather than a hybrid.

Pomegranate: Wonderful (the dominant commercial variety, deep red, tart), Mollar de Elche (Spanish, soft seeds, sweeter), Bhagwa (Indian), and various soft-seeded Iranian and Indian types that are far easier to eat.

Persimmon: Fuyu and Jiro (non-astringent, eat firm), Hachiya (astringent, eat soft), Rojo Brillante (Spanish, astringent but sold CO₂-treated as Persimon).

Also worth knowing: medlar, a Rosaceae fruit that must be bletted, that is, left until it begins to decay internally, before it is edible; it was a common winter fruit in medieval Europe and is now almost extinct commercially. Loquat, an evergreen relative that fruits in spring, common across the Mediterranean and Asia, with large seeds that contain cyanogenic glycosides and should not be eaten.

11. Myths and confusions

Don't be confused: a Sharon fruit and a persimmon are the same species. Sharon fruit is a non-astringent persimmon that has been additionally treated to guarantee no astringency. The important distinction is astringent versus non-astringent type, not the brand name.

• "Pomegranate juice prevents prostate cancer." The randomised trial was negative, and the leading brand's health claims were ruled deceptive by the US FTC.
• "Pears are low in nutrients." They are one of the higher-fibre common fruits, most of it in the skin.
• "You should let pears soften all over before eating." By then the core is mush. Check the neck.
• "The white membrane in a pomegranate is inedible." It is edible and very bitter; there is no reason to eat it.
• "Quince is just a hard pear." It is a different genus and is genuinely inedible raw.

12. The bottom line

• European pears must ripen off the tree or they rot from the core outward. Buy hard, ripen on the counter, and press the neck, not the body.
• Pears are high in fibre and high in sorbitol, which makes them mildly laxative and one of the most reliable IBS triggers among fruits.
• Pomegranate is the best-evidenced of the fashionable juices, with consistent modest blood pressure reductions, and its prostate cancer claims failed the randomised test. Eat the whole arils rather than drinking the juice, and note the CYP3A4 interaction.
• Persimmons come in two types: astringent ones must be eaten jelly-soft, non-astringent ones can be eaten crisp. Large quantities of unripe persimmon can form stomach bezoars in people with slow gastric emptying.
• Quince is inedible raw, transforms on long cooking, and is a pectin powerhouse.

Sources and notes

Composition figures are from USDA FoodData Central; production figures are approximate FAOSTAT values for the early 2020s. Pear cultivation, fire blight, stone cells, and the necessity of off-tree ripening follow Oregon State and Washington State tree fruit extension publications and USDA Handbook 66. Pomegranate cultivation and aril chemistry follow Holland's and Stover's reviews. Punicalagin conversion to urolithins and metabotype variation follow Tomas-Barberan, Garcia-Villalba, and Espin. Pomegranate juice and blood pressure follows Sahebkar et al.'s meta-analysis, Pharmacological Research, 2017. The prostate cancer sequence is Pantuck et al.'s 2006 single-arm trial followed by the negative randomised trial of Paller et al., Prostate Cancer and Prostatic Diseases, 2013; the US Federal Trade Commission action against POM Wonderful concluded in 2016. Persimmon astringency, tannin chemistry, and CO2 deastringency treatment follow Spanish IVIA research on Rojo Brillante. Persimmon phytobezoar is documented in extensive gastroenterology case literature, with impaired gastric emptying as the main risk factor. Quince pectin content and medlar bletting follow standard pomology references.

Open questions. Whether pomegranate's CYP3A4 inhibition is clinically important is much less clear than for grapefruit, resting mainly on case reports rather than controlled interaction studies.

👉 Next: figs, dates, and dried fruit.