They set the balance. Acid cuts fat, reins in sweetness, denatures protein and triggers leaveners. When a dish tastes like something is missing, it is usually acid rather than salt.
Heat drives the aroma out of acid. Squeeze the lemon at the table, not into the pot, and add vinegar at the end.
Temper it with a few spoons of the hot liquid before it goes in; added straight, it splits.
Covered at 4 °C for 2-3 weeks; the liquid that gathers on top is whey — stir it back in rather than pouring it off.
Plain yoghurt is milk and cultures only, with no gluten. Fruit and cereal-added yoghurts must be judged separately.
Allergen: DAIRY
35 — glucose is taken as 100. Below 55 is low, 56–69 medium, 70 and above high. The number says nothing about portion: at the same index, twice the amount is twice the load.
The source table has a single study for this food. It is a real measurement, but it may not be typical: variety and ripeness move this number easily.
Row in the table: Yoghurt, natural, UK (35+/-10)
Atkinson et al., Am J Clin Nutr 2021
"They go well together" is not an explanation. Every pairing below has a chemical or structural mechanism under it.
Garlic
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Milk fat and casein bind the lipophilic thiosulfinates and polysulfides from crushed garlic, blunting the raw burn while keeping the aroma. That is why garlic yoghurt is pleasant where raw garlic alone is not.
Egg
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Gelatinised starch and egg proteins sterically shield the casein micelles from one another and raise the temperature at which the sauce breaks. That is what terbiye is; without it yoghurt curdles as soon as it nears a simmer.
Chilli flakes
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Casein is hydrophobic and scavenges capsaicin off the TRPV1 receptor while the butterfat dissolves it. Two separate mechanisms, which is why yoghurt against chilli is measurable rather than folk.
Lemon
Adding acid to a hot yoghurt sauce pushes the pH further past the isoelectric point and hastens the split.
Much of the lactose is fermented to lactic acid and the live cultures supply β-galactosidase, so yoghurt is tolerated by many people who cannot drink milk.
25 dishes in the database use it.
The default Turkish yoghurt soup and the textbook terbiyeli çorba. Rice simmers in water, yoghurt, flour and egg yolk are beaten separately, tempered with hot broth, returned to the pot and thickened without ever boiling. Finished with dried mint bloomed in butter.
A ceremonial soup cooked in meat broth whose identity is its terbiye: strained yoghurt, egg yolk, flour and lemon juice beaten separately, tempered, and stirred in. Finished with butter and chilli.
A thicker, more archaic cousin of yayla çorbası: hulled wheat instead of rice, strained yoghurt instead of plain. A hospitality dish made in big pots at religious holidays, eaten hot or cold.
A grain and pulse soup carried on thinned yoghurt. Wheat and chickpeas are soaked overnight, boiled separately, then folded into salted, watered yoghurt. Made hot in some regions and cold in others.
It deserves its own record because the technique is categorically different: nothing is heated. Boiled and cooled chickpeas and wheat are stirred into yoghurt thinned with cold water and salted, then dill, dried mint and ice go in.
A yoghurt soup thickened with chickpeas and hulled wheat, finished with garlic and mint in butter. The Antep version adds small köfte. In Mardin it goes by çoban çorbası.
Small cut noodles cooked with meat or lentils, with garlic yoghurt poured over at the plate rather than stirred into the pot. This is a far older and far simpler answer to the curdling problem than terbiye.
A Turkish mezze of yoghurt, cucumber, garlic, salt, water and olive oil. A hot-weather dish whose consistency runs from thick enough to spoon to loose enough to drink — both are correct, and it varies by region.
A thick mezze of strained yoghurt, garlic and herbs. One thing separates it from cacık and it is decisive: haydari has no cucumber and the yoghurt is strained, so a spoon stands up in it.
Tiny dough parcels are boiled, laid over garlic yoghurt and finished with sizzled butter and chilli. Dried mint and sumac come last.
The Gaziantep classic: charred aubergine crushed with garlicky yoghurt under sautéed lamb. The aubergine must meet fire; made with oven-roasted aubergine it is simply not the dish.
Tiny balls of rice flour and minced lamb, rolled by hand, cooked with lamb shank and chickpeas, with a yoghurt and butter sauce stirred in at service. The consistency is close to a soup, but in Gaziantep it counts as a main.
Tiny bulgur-cased köfte cooked with chickpeas in a yoghurt broth. Gaziantep sources insist it is not yuvalama: yuvalama’s balls are rice flour, ufak köfte’s are bulgur.
Turkey’s everyday tea cake. The yoghurt is both the liquid phase and the acid half of the chemical leavening.
Walnut-filled dough ovals are pressed against a sieve to emboss ridges, baked and soaked in syrup. The name comes straight from that gesture.
A pale tray bake cut into squares or diamonds and drenched in cold syrup. It looks like revani but is made with flour rather than semolina, and the yoghurt is genuinely in the batter.
Yoghurt let down with water and salted. Turkey’s national drink, and really yoghurt made portable: on the move it both slowed spoilage in heat and replaced the salt lost through sweat.
Not to be confused with ordinary ayran — it is a different substance: the liquid left after butter has been churned out of yoghurt. Yoghurt destined for butter is deliberately fermented longer, which is why churn ayran is markedly sourer.
Yoghurt drained in a cloth bag to remove the whey. The base for mezes, and the terbiye of toyga and düğün çorbası.
Yoghurt strained further than süzme, salted, and taken to a spreadable consistency. Süzme is lighter and silkier; labne is denser and sharper, and is served with olive oil.
Skimmed yoghurt or churn buttermilk is strained, kneaded hard with salt, formed into egg-sized balls and sun-dried until rock hard. It rehydrates into a sour paste or is grated into soups.
A winter store made by fermenting, drying and milling a dough of flour, yoghurt, vegetables and spices. One of the few doubly fermented cereal-dairy composites in the world: both lactic acid bacteria and yeasts are at work.
The curd that precipitates when de-fatted ayran or churn buttermilk is heated. In some regions it is made from whey instead, so çökelek is a product class defined by its acid-and-heat coagulation rather than by one starting material.
A hard cheese made from strained yoghurt and put through a ten-day drying. Bolu keş comes in blocks; the related katık keşi is shaped like a spinning top.
The most heavily spiced member of the çökelek family. The curd is kneaded with pepper paste and a broad spice battery led by wild thyme, then formed into cones and matured.
LemonpH 2.2 · 5% citric acid
Vi
VinegarpH 2.4–3.4 · 5% acetic acid
Pm
PomegranatepH 3.0 · anthocyanin turns blue in base
Tp
Tomato pastepH 4.3 · glutamate 250 mg/100 g
Ne
Pomegranate molasses21.6% water · 308 kcal
Lt
Citric acid (food grade)?
Bi
Red pepper paste?
S2
Pickled cucumber94.3% water · 12 kcal
Nothing matches that.
Mint 
Olive oil 
Butter 
Spinach 
Walnut