Add 4 Tablespoons water to a large skillet along with the onion slices. Cook over medium heat, stirring occasionally until the water has evaporated and the onions are beginning to brown on the bottom of the pan (about 8 minutes). Add another 4 tablespoons of water to the pan and let it cook off again, stirring occasionally. The onions should be nicely browned and caramelized. Set aside