heat coconut oil in a cooker, fry chopped sahllots, ginger and green chilli until shallots turn brown.
further add tomatoes and fry till mushy
grind together coconut, coriander powder, chilli powder and sambar powder and add it to the cooker along with cauliflower and potatoes.
Add water, salt and turmeric powder, close and pressure cook for 3-4 whistles.
open and mash it slightly
for tempering, heat oil and crackle mustard seeds, cumin seeds, curry leaves and onions chopped. add salt for the onions to fry and fry till brown
add the tempering to the curry
mix well and serve