Now, grind the onions,garlic,ginger to a smooth paste using a hand mixer or blender adding little water and keep aside.Heat ghee in a heavy bottom pan on low heat, add the cinnamon stick and finely chopped onions and sauté till it becomes translucent.Add the ground spice paste and saute until the raw smell of the ginger-garlic goes away. Add the finely chopped tomatoes and cook until it turns soft and mushy.