The sausage links and the caramelized onions can be cooked the night before. For the caramelized onion, dice about ½ of a large onion. Over medium heat, add 1-2 tablespoons of oil and add the onion. As the onion starts to turn brown at the edges and there is browning on the bottom of the pan, add ¼ cup of water. Saute until the water has been cooked away. Keep doing his process until the onions are the desired degree of caramelization.