I am a dish with a complex flavor profile, often enjoyed during festivals and celebrations in South India. My preparation involves a meticulous process of layering rice with various ingredients and spices, and I am slow-cooked to perfection. The key to my distinct aroma lies in the use of specific herbs and sometimes meat. What am I?

1. I am traditionally cooked in a heavy-bottomed pot.
2. My flavors are a blend of sweet, sour, and spicy.
3. I am often associated with special occasions.
4. The rice used in my preparation is a crucial element.