Grind coconut, cashews, and poppy seeds into a fine paste.
Temper spices in oil and sauté onions, chillies, and ginger garlic paste.
Add tomatoes and fry until soft.
Mix in paste, potatoes, and cauliflower. Season and add water.
Pressure cook for 4 whistles.
Mash vegetables, add coconut milk, and mix.
Prepare tadka with Kashmiri chilli powder and add to curry.
Serve hot with idiyappam or appam.