01 -
1 pound of ground beef.
02 -
1/2 cup of finely chopped yellow onion.
03 -
2 teaspoons of olive oil.
04 -
Salt and pepper as needed.
05 -
1 ciabatta loaf, sliced lengthwise.
06 -
2 tablespoons soft unsalted butter.
07 -
1 teaspoon of garlic powder.
08 -
2 cups of cheese: 1 cup mozzarella and 1 cup sharp cheddar, shredded.
09 -
2 garlic cloves, minced.
10 -
1 1/2 cups of ketchup.
11 -
2 tablespoons of brown sugar.
12 -
1/4 cup of water.
13 -
1 teaspoon of yellow mustard.
14 -
1/2 teaspoon of Worcestershire sauce.