All 16 chapters on one page, in order. Read straight through, or jump to a chapter below.
Read one chapter at a timeA squeeze of lime on a plate of lentils or greens roughly doubles the iron you absorb from it.
Limu omani is dried lime, and it tastes nothing like the fresh fruit.
The sourness is what balances a rich khoresh in Persian nutritional thinking.
Neat lime juice is hard on tooth enamel. Rinse with water, and wait before brushing.
Limu torsh is the small green lime of the southern provinces, and limu omani is the same fruit boiled in salt water and dried until it's black and hollow. Fresh lime goes on the table beside the rice. Dried lime goes into the pot and stays there for hours, giving ghormeh sabzi and gheimeh the sour, slightly fermented depth that nothing else produces. Both are the same fruit at different ages, and Persian cooking would collapse without either.
Known to botanists as Citrus aurantiifolia.
Limu omani came into Persian cooking through the Gulf trade with Oman, which is where the name comes from. It is now inseparable from ghormeh sabzi, the dish most Iranians name first when asked what home tastes like.
Persian temperament: Cool & Dry (2nd degree). Cools stomach heat, opens the appetite, cuts phlegm. Drying in excess, so it's used as a correction rather than a food in itself.
Persian medicine reads limu torsh as cold and dry in the second degree. It cuts phlegm, clears heat from the stomach and liver, opens a closed appetite, and settles nausea. It is the standard correction for a dish that's too rich or too warm in nature, which is why it lands on lamb, on rice and on anything fried.
Dried whole limes travelled the Gulf trade routes because they keep for years without spoiling.
Hakims gave lime juice in water for nausea, fever thirst and a closed appetite.
Fresh juice was used on the skin for blemishes and dark patches, a practice better avoided in sunlight.
Primary compounds
Vitamin C is the reason lime does what it does for iron absorption.
Limonene is the oil in the peel and the source of the smell.
Hesperidin and naringenin are the citrus flavonoids (a family of protective plant compounds), concentrated in the peel and pith.
Furanocoumarins (a compound found in grapefruit that blocks that enzyme) in the peel are what make lime juice on sunlit skin a problem.
Other notable constituents
Minerals: Potassium, Calcium · Fiber: About 1.9 g per whole fruit, almost none in the juice
Strong evidence
Vitamin C substantially increases absorption of non-heme iron from plant foods eaten in the same meal.Strong evidence
Lime juice on skin exposed to sunlight causes phytophotodermatitis, well documented in clinical case series.Strong evidence
Moderate evidence
Citrus flavonoid intake is associated with improved endothelial (relating to the thin inner lining of your blood vessels) function in controlled trials.Moderate evidence
In the kitchen: at the table, on the plate, at every meal that involves rice or pulses. Roll the fruit hard on the counter before cutting; it yields far more juice. Pierce dried limes two or three times so the liquid gets inside them.
Add dried lime in the last hour of a stew. Longer than that and it turns bitter.
In the kitchen: crack a dried lime and steep it in hot water for ten minutes for tea. Squeeze fresh over rice, khoresh and grilled meat.
Simmer whole dried limes in ghormeh sabzi and gheimeh.
In the kitchen: zest into cakes and syrups. Squeeze half a lime over rice, lentils or greens at the table. Pierce two dried limes and drop them into the stew for the last hour.
Iranian diets lean on lentils, beans and greens for iron, and plant iron is poorly absorbed on its own. Vitamin C alongside it changes that severalfold. The habit of squeezing lime over every plate isn't decoration. It's the reason the meal works.
Iron and vitamin C both tend to run low after 70, and appetite fades with them. Sour flavour is one of the few things that reliably wakes an older appetite. A lime on the table does more practical work than most supplements.
The sourness opens the appetite and gets digestion moving.
Citrus flavonoids in the peel support blood vessel function.
The peel oils are mildly antimicrobial, which is part of why lime was used to dress raw food.
Lime juice on skin in sunlight causes phytophotodermatitis, a real burn that leaves brown marks for months. Wash your hands after squeezing if you're going outside.
Neat juice erodes tooth enamel. Rinse your mouth with water afterwards and leave half an hour before brushing.
It can set off reflux (stomach acid rising into the throat) in people prone to it.
Known citrus allergy.
Active mouth ulcers or severe reflux while symptomatic.
Statins (cholesterol-lowering medicines) and other CYP3A4 (a liver enzyme that breaks down many medicines) medicines — Lime peel carries some of the same compounds as grapefruit. Ordinary juice isn't a concern; large amounts of peel or lime oil could be. (low concern)
Pregnancy and breastfeeding
Useful throughout. The sourness settles nausea, and the vitamin C helps you take up iron from the lentils and greens that most pregnancy diets lean on.
Children
Children mostly refuse neat lime and there's no reason to insist. A squeeze over their rice does the same iron job without the argument.
Older adults
Sour flavour survives when other tastes fade, so a lime on the table is one of the few reliable ways to make food interesting again. Watch the teeth: enamel is thinner at 80 than at 30.
Lentils
Squeeze lime over the plate. The vitamin C is what unlocks the iron in the lentils.
Rice
Lime cuts the richness of buttered, saffroned rice.
Fenugreek
Dried lime and fenugreek greens are the two flavours that define ghormeh sabzi.
Mint
Lime and mint in cold water is the Persian summer drink.
Spring
Fresh limu torsh from the south is at its best. Use it on everything.
Summer
Lime in water first thing is the classical Persian answer to a summer appetite that has closed.
Autumn
The turn toward stews. Dried limes go back into the pot.
Winter
Limu omani season in the kitchen, in ghormeh sabzi, gheimeh and soups.
What is limu omani exactly?
A lime boiled in salt water and dried in the sun until it's hollow and black. It keeps for years and tastes sour, earthy and slightly fermented, nothing like fresh lime.
Can I use lemon instead in ghormeh sabzi?
You will get sourness but not the flavour. Dried lime brings a fermented depth that fresh citrus can't imitate. Most cooks would rather leave it out than substitute.
Why did my stew turn bitter?
The dried limes were in too long or split open early. Add them in the last hour and take them out before serving.
Does lime water help you lose weight?
No. It replaces sweet drinks, which helps, and it costs nothing. The lime itself doesn't burn anything.
End of the Lime guide