For gravy. Grind onion, cashew nuts, ginger, garlic and green chilli. In the same Kadai. Add little oil. Add cumin seeds, whole red chilli let it crackle. Add turmeric powder, red chilli powder, ginger, garlic, cashew nuts paste, garam masala powder,spinach paste. Mix it properly. Saute it for 3 minutes. Add 1 cup water. Once it starts boiling. Add koftas and cook in slow flame. Till it becomes gravy.