Keerai Sambar is a South Indian lentil soup made with a variety of greens like spinach, amaranth, or fenugreek leaves. It is a nutritious and flavorful dish that is typically served with rice or idli. The sambar is prepared by cooking lentils with a mix of vegetables, tamarind pulp, and a special blend of spices. The greens are added towards the end and cooked until wilted. This comforting and wholesome dish is a popular choice for lunch or dinner.