The main ingredient in traditional dahl soup is lentils, which are small, dried legumes that come in various colors, including red, green, and yellow. Lentils are a staple in Indian cuisine and are celebrated for their high protein content, fiber, and nutritional value. In dahl preparations, the lentils are typically simmered with water and seasoned with a mix of spices, such as turmeric, cumin, and coriander, along with onions, garlic, and sometimes tomatoes. This simple yet flavorful dish is often served with rice or flatbreads and is a comforting source of nourishment in many households.