- Heat Oil in Pan. Add Mustard Seeds and Cumin Seeds . Add slit chillies, Onion, Capsicum one after the other, and let onions become transparent. 4Add Corn with a little Butter and let it cook for 1 mits. 5Add Spinach and pour some water then add Salt, Garam Masala, Pepper. Let it cook until the consistency u want. And serve hot