Spices include cloves, cinnamon, coriander, pepper, cardamom, cumin, and fenugreek (kasuri methi). Cashew paste is also used as a thickening agent. Garnishes can include butter, coriander, cream, green chilies, and fenugreek. Without butter, you simply can’t have butter chicken. So after adding the spices and tomato sauce, adding more heavy cream and butter is a must. I know it’s a high-calorie meal which is a full-fat dairy meal, buttery, creamy, spiced up with sauce. But let me tell you once in a week or so it’s perfectly fine. Forget everything on that day and just enjoy this delicious authentic butter chicken recipe.