While the butter and olive oil are melting, slice the onions. I used vidalia onions in mine because they are sweeter by nature. Halve the onions and remove the skin. Slice these into half moons and add all the onions to the pot and top with 1 teaspoon of salt. Stir and let these cook down. Once the onions are translucent, turn the heat down to medium-low, and let these start to take on a nice golden color, about 25 minutes.