If you have homemade or store bought makhani sauce then here is how you use it. Heat 1/2 teaspoon butter or oil in a pan. Add 1 cup of makhani sauce with a splash of water. Stored sauce thickens so the water is required. Mix well and simmer for 3-4 minutes. Add the paneer cubes and mix well. Simmer for a minute and remove from flame. Makhani sauce is basically a creamy tomato based sauce.