Foods In South Asia

South Asia's foods are combined with all types of chilies, peppers, herbs, and other strong herbs. They also use a lot of very common meats such as lamb,  goat, and chicken. Beef is not so popular in the western cuisines because lamb, and goat have a special place in Hinduism. Many of the foods go back as well about five thousand years ago. They usually cook outside because of there tradition. Why do they use tunes of spices in there foods?