After giving it a few quick rinses, soak the Urad dal in sufficient water for three to four hours or overnight.
Transfer the Urad dal to a grinder or blender. Grind to a coarse or semi-fine paste, either completely dry or with very little water added.
Heat a pan with ½ tbsp. of ghee. Stir in the cumin seeds and allow to sizzle.
Add the chopped ginger and green chillies after that. Cook until the ginger's raw smell disappears. You can switch off the heat or maintain a low flame.
Add a pinch of asafoetida (Hing), crushed fennel seeds or fennel powder, turmeric powder, red chilli powder, and coriander powder.
Make sure the spices don't burn by thoroughly mixing. Add the Urad dal paste after that.
The Urad dal past should first be mixed and then sautéed over low heat. It would help if you indeed mixed with some hand pressure.
Season with salt to taste.
Stir once more, and then simmer the Urad dal paste, stirring frequently, until it thickens and slightly dries.
The paste should have a dry, dough-like consistency rather than a wet one. Let the paste cool.