Yogurt is a
thick and tasty product made from
milk. It is actually made by
bacteria, which thrives in milk. The flavor of yogurt actually comes from
lactic acid which is produced by the bacteria
fermenting the milk.
Yogurt bought in the store is usually an active, living, culture of this bacteria. As such it is very easy to make your own yogurt! Just bring some whole milk to a boil, and let it boil for 10 mins. Let it cool till you can stick your thumb in it without it being too hot (or about 97 F). Then add some plain yogurt. Cover, and let it sit out for a day or two. (actually room temperature isn't hot enough, it needs to be kept at a temperature about 95 F)
For added flavor, use Goat Milk. A nice treat can be made by adding some shredded cucumber, a little mint and a dash of black pepper. Just dip your pita bread in it for a nice traditional persian snack, called maast o'okeeyaar.