1. If you are using dry peas cook it before adding to the gravy
2. Almonds, pecans, cashew or any other nuts can be used for richness
3. Onion - tomato can be boiled instead of sauting
4. Same quanity of freah cream/heavy cream can be used instead of evaporated milk
5. 1/2 cup of whole / 2 % milk can also used and cooked in low flame to avoid curdling
Coconut milk and coconut oil can used instead of evaporated milk and butter for vegan version