Soak black peas in water overnight.
Cook it in the pressure cooker adding double the water and a pinch of salt and cooking soda. Once cooked do not throw the water as it will be used at a later stage.
In a pot heat 1 tbsp oil, add dices onion, garlic cloves, fennel seeds and saute for 5 minuted on low heat.
Add dry coconut and saute for a minute.
Let the mixture cool. Blend it in a blender to make a puree.
In a pot heat 2 tbsp oil. Add mustard seeds. When they starts to sputter add turmeric powder, asafoetida, cinnamon stick, black peppercorns, cloves. Saute for a minute.
Add cooked black peas and saute for 5 minutes.
Add the puree and the water in which the black peas are cooked.
Add garam masala and salt.
Let the usal cook for 10-15 minutes on a low heat.