Pour about 3 tablespoons of cooking oil into a medium pot and heat it over medium-high heat. Wait until the oil reaches the proper frying temperature, then add the chicken to the pan and fry the chicken skin until it achieves a golden brown color on both sides.
Using the same pot and maintaining the same heat, add 1 tablespoon of butter and onion. Sauté them well until the onions are coated in the oil and butter, allowing them to sizzle as they cook.