Puree onion, garlic, and ginger in a food processor or blender. Heat oil, butter or niter kibbeh in a large, heavy-bottomed saucepan. Add turmeric, paprika and cayenne pepper and stir rapidly to color oil and cook spices through, about 30 seconds. Add onion puree and sauté on medium heat until excess moisture evaporates and onion loses its raw aroma, about 5-10 minutes. Do not burn.