Soak the moth beans overnight (or till they double). Drain (at this stage, you can sprout them or use as is).
In a saute pan, add 1 tsp oil. Saute the onions + whole spices (in the spice paste list) till onions caramelise. Cool and grind this with the spice powders + coconut to a smooth paste
In a pressure pan, heat oil.
Splutter the Cumin and mustard and curry leaves.
Add turmeric, minced onion .Add salt and sauté well till onions turn golden brown. Now add soaked matki (moth beans), cubed potato tomato and the spice paste.
Sauté well for 3-4 mins till the oil slightly separates.
Add 1-1.5 cups of water and pressure cook for 4-5 whistles.
If using Instant Pot, pressure cook MANUAL on HIGH for 15-20 mins, 10 min NPR.
Alternatively you can also simmer this gravy on open pot for a more “bite-in-the-mouth” feel of the legumes. The cooking time may slightly vary then
Let the pressure come down on its own. Mash up the potatoes a bit to give the gravy more volume and body.
Add 2-3 TBSP water if you need to adjust the consistency to a gravy like texture.
Let it simmer for 1-2 mins , at this stage adjust salt and spices.
Finish with lemon juice and chopped cilantro.
Serve hot with Chapatis or Pav (bread rolls)