For makin gravy chopped onion and tomatoes roughly.in a pan add then add two tbsp butter heat it.then add mace and cardamom.saute few seconds, add chopped onion saute untill they turn translucent add tomatoes cashew, ginger garlic paste,red chilli powder,1/2 tsp garam masala powder 1/2 salt and mix well.cover and cook on medium flame for 5-6 minutes to turn soft.turn off the flame transfer in a plate.after it becomes cool grind it in mixer grinder to make a smooth paste.