if it's raita you mean, it's made with natural yoghurt, finely chopped cucumber and fresh chopped mint. some say add cumin or other spices too. if you look on the web, you'll see a number of variations.
Bit of a secret recipe here (got the recipe off an indian gent i work with)
1 large pot natural yoghurt
6 Tablespoons mint sauce
2 Tablespoons tomato sauce
1 Tablespoon Brown Sauce (I was confused by this, but looking at the ingredients on the bottle clears things up a bit)