Step 1
Heat oil in a large pan over high heat and add mustard seeds; fry until they begin to pop, about 1 minute. Reduce heat to medium and add carrots, celery, onion, garlic, and ginger. Cook until vegetables begin to soften, about 5 minutes. Stir in lentils, coriander, salt, turmeric, cumin, cayenne, cinnamon, and cloves. Pour in water and tomatoes. Bring to a boil, reduce heat, and cover. Simmer until lentils are soft, 15 to 20 minutes.