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Why Tzatziki Curdles — and Why It Rarely Does in Greece

Tzatziki looks like the easiest thing on the table: yoghurt, cucumber, garlic, a little acid, a little oil. Then you make it at home and end up with a pale puddle in the bottom of the bowl and a garlic burn at the back of your throat. In a Greek taverna the same four ingredients arrive thick enough to hold the tines of a fork, cool and clean-tasting, with garlic you notice rather than regret.

The difference isn't a secret ingredient. It's drainage, order and restraint. Nearly every fault comes down to three things: too much water, garlic added too harshly, and acid thrown into a yoghurt that was already thin to begin with.

Start With a Full-Fat Yoghurt, Then Strain It Properly

Supermarket yoghurt in the UK varies enormously. Look for a Greek-style yoghurt with a fat content of around 10 per cent — the label will usually say "strained" or "Greek style". Anything marked 0 per cent or fat-free is set with starch and thickeners, and it will never give you the body you want.

Then do the thing most recipes only hint at: tip the yoghurt into a muslin-lined sieve set over a bowl and leave it in the fridge for two to four hours, or overnight. From 500g of yoghurt you should lose 100–150ml of whey. If you're short of time, line a sieve with kitchen paper and give it half an hour — not perfect, but far better than nothing. Straining does two jobs: it thickens the dip and removes the loose whey that would otherwise seep out the moment you add salt and lemon.

The Cucumber: Grate, Salt, Squeeze — Don't Skip This

A cucumber is mostly water, and that water is the enemy. For every 500g of yoghurt, use half a large cucumber or one small one. Grate it coarsely, not finely, or you'll be left with mush. Toss the grated flesh with half a teaspoon of fine salt in a colander and leave it for twenty minutes.

Then squeeze it. Take it in handfuls and press hard over the sink, or wrap it in a clean tea towel and wring it out properly. You should be left with roughly a third of the volume you started with. That sounds excessive. It isn't. If your tzatziki turns watery an hour after you make it, this is almost always the step you rushed.

Garlic Without the Burn, Acid Without the Curdle

Raw garlic is the other classic fault. A clove crushed and stirred straight in keeps getting hotter as the dip sits, so a perfectly pleasant bowl on Friday is almost aggressive by Sunday. Instead, grate one small clove on a microplane — or crush it to a paste with a pinch of salt — and let it sit in the lemon juice for ten minutes before it goes anywhere near the yoghurt. The acid rounds off the raw edge. Start with one small clove per 500g; you can always add more, and you can't take it out.

For acid, one to two teaspoons of lemon juice is plenty, or a teaspoon of white wine vinegar for a sharper, more northern Greek character. Add it at the end and fold it in gently. Salt draws water out of everything, so season the finished dip last and lightly — the cucumber has already brought its own.

Putting It Together: The Method

• Strain 500g full-fat Greek-style yoghurt in muslin for two to four hours, ideally overnight.
• Grate half a large cucumber, salt it, rest for 20 minutes, then squeeze it thoroughly dry.
• Grate one small garlic clove into 2 tsp lemon juice and leave for 10 minutes.
• Fold together the yoghurt, cucumber, garlic-lemon mixture, a tablespoon of chopped dill or mint, and a good pinch of salt. Use a spoon, not a whisk — don't beat it.
• Stir in 1 tbsp extra virgin olive oil at the end, then drizzle a little more over the top to serve.
• Chill for at least 30 minutes. Taste again before serving, because cold mutes seasoning and you may want another squeeze of lemon.

The oil goes in last and slowly, which keeps everything stable. Vigorously beating cold yoghurt is one of the few reliable ways to split it at home. If yours does look grainy, don't panic — fold through a spoonful of fresh yoghurt and it will come back together.

Serving and Storing — The Taverna Way

In Greece, tzatziki isn't a dip on a party platter. It's part of the table, arriving beside grilled meat, fried courgette, warm bread, or simply a plate of tomatoes, olives and feta. It's served cool rather than ice-cold, and it's never shy of olive oil.

Keep it covered in the fridge and eat it within three days, remembering that the garlic will sharpen each day — so if you're making it ahead, hold a little back. Don't leave the bowl sitting in the sun at a barbecue; heat is what splits it. Any leftovers that have loosened can be stirred into a dressing, spooned over roast potatoes, or used as a marinade for chicken.

As for the herb, it's regional: dill in the north, mint on the islands, and both are perfectly good. Make it once this way — strained, squeezed, and gently folded — and you'll never go back to the thin, watery version.