The principal ingredient in traditional Indian curry is typically a blend of spices, but the base often includes onions, garlic, and ginger. These ingredients are sautéed to create a flavorful foundation. The spices used can include turmeric, cumin, coriander, and garam masala, among others, depending on regional variations. Sometimes tomatoes or yogurt are added to enhance the sauce. Casseroles can contain a variety of proteins, vegetables, or legumes, cooked in this aromatic base. India boasts a rich culinary heritage that varies widely across different regions, so curry recipes can differ widely, offering countless flavor profiles.