01 - 1/2 cup ketchup
02 - 2 tablespoons light brown sugar, packed
03 - 1 tablespoon apple cider vinegar
04 - 1 tablespoon Worcestershire sauce
05 - 1/2 teaspoon garlic powder
06 - 1/2 teaspoon onion powder
07 - 1 tablespoon unsalted butter
08 - 1 tablespoon all-purpose flour
09 - 1 cup whole milk
10 - 6 ounces shredded sharp cheddar cheese
11 - 2 cups low sodium beef broth
12 - 1 pound thinly sliced deli roast beef
13 - 4 onion hamburger buns