Soak and rinse the yellow split lentils well.
Heat a deep pot on the stove and add the butter.
Once the butter begins to melt, add the onion and chopped tomatoes. Sauté for about 1 minute.
Add the cumin seeds and mustard seeds. Stir and sauté for another minute.
Add the soaked yellow split peas, along with the seasonings — curry powder, salt, turmeric, and chilli powder. Mix well, then pour in enough water to cover.
Cook until the peas are soft and tender.
Add the pumpkin cubes and continue cooking until the pumpkin is soft.
Stir in the coconut cream, cashew paste, and capsicum. Cook for another 2–3 minutes.
Serve warm with brown basmati rice or white rice.