"Thakkali Pachadi" is a delicious and tangy South Indian tomato-based condiment, commonly served with rice, dosas, idlis, or chapatis. It is part of a broader category of dishes called "pachadi," which in South Indian cuisine refers to a traditional side dish similar to chutneys or raita in North Indian cuisine but typically uses coconut, mustard seeds, and yogurt. Thakkali Pachadi specifically uses tomatoes as the main ingredient.