Tzatziki is by far the most the most popular Greek dip or appetizer, also found in the cuisines of Southeast Europe and the Middle East. Tzatziki sauce have many uses – it is used for grilled meats and veggies, appetizer spreads, sandwiches and salads. Basically, it is made of traditional yogurt and cucumber sauce with fresh herbs. Oooh, you’re gonna love tzatziki so much. It is so creamy and flavorful and is very easy to prepare.