Haydari is a typical meze (appetizer) made with strained (thick) yogurt. You can strain regular yogurt and keep it in the refrigerator to be used for dips and mezes. To make strained yogurt, first place a cheese cloth or muslin on a sieve. Place the sieve over a large bowl. Put a tub of yogurt into the sieve. Let it drain in the refrigerator for at about 12 hours. If you let it drain for 24 hours, yogurt will be very thick, a bit softer than cream cheese. I started with 2 cups of yogurt, after leaving it in the fridge overnight, I ended up with 1 1/2 cups of strained yogurt. If you don’t want to wait, then substitute Greek style yogurt for this dip.