Slice the onions. Set aside. Pour about 1-2 tbsp olive oil in pan and about 1 1/2 tbsp butter and mix together until heated. Pour onions in pan on med heat and continue stirring frequently for about 30 minutes.

About 15 minutes in add 2 tsp of brown sugar and pinch of salt and pepper.

Slice the ciabatta bun lengthwise and butter both sides and grill the inner side of bun on stove. Once grilled put your onions on the bun and top with grated cheese and the other bun. Toast both sides of bun. Extremely delicious!