In a medium saucepan, combine 2 cups of water , lentils, turmeric, garlic, and tomatoes. Bring to boil. Lower the heat, cover the pot with a lid and gently simmer until the lentils are tender, almost translucent, and almost falling apart, about 30-40 minutes.
Add salt, to taste.
Meanwhile in a small skillet, over a medium-high flame, warm 1 tablespoon coconut oil. Once the oil is shimmering add onion, cumin seeds and chili until onions are brown.