2 cups dry masoor dal (red lentils), sorted and rinsed

8 cups water

1 tbsp oil (coconut or neutral flavored)

1 large yellow onion, finely diced

6 cloves garlic, minced

1 tbsp minced ginger

2 green chiles, minced (seeded for less heat, optional)

1 tbsp Indian curry powder

1 tsp whole mustard seed

1 tsp ground coriander

1/2 tsp ground cumin

1 1/2 tsp salt, more to taste

1 (15 oz) can diced tomatoes (or 1 1/2 cups fresh chopped tomatoes)

Fresh cilantro, for garnish

Basmati rice, for serving