Steps
1. Rinse toor dal thoroughly and pressure cook with 1.5 cups water and turmeric until soft (about 3-4 whistles).
2. Soak tamarind paste in 1/4 cup warm water, extract juice, and keep aside.
3. In a pot, heat oil and add mustard seeds, dried red chili, and curry leaves. Let them splutter.
4. Add chopped vegetables and sauté for 2-3 minutes.
5. Pour in 1/2 cup water and cook vegetables until tender.
6. Add cooked dal, tamarind juice, chopped tomato, sambar powder, and salt. Mix well.
7. Let the sambar simmer for 10-15 minutes on low heat, stirring occasionally.
8. Garnish with fresh coriander leaves and serve hot with rice or idli.