Dice onion, add 2 tablespoons of olive oil to a sauté pan cook on medium heat for 5 minutes then lower heat to low, stirring every few minutes until golden and caramelized (about 25min)
Meanwhile, brown 1 pound of beef in oil. Season with salt and pepper and break into crumbles.
Sliced Hawaiian rolls through the center. To the bottom half, a layer of American cheese, your crumbled ground beef, caramelized onions, and one more layer of American cheese.
Spread secret sauce on and then add the top layer of buns.
Melt butter with garlic salt for 20-30 seconds in the microwave and brush over the buns.
Bake in a 350° oven for 20 minutes and serve.
