Boogaloo Wonderland Sandwiches | America's Test Kitchen

Ingredients

• 1 cup ketchup
• 3 tablespoons cider vinegar
• 2 tablespoons packed brown sugar
• 2 tablespoons Worcestershire sauce
• 3/4 teaspoon dried thyme
• 3/4 teaspoon dry mustard
• 3/4 teaspoon granulated garlic
• 3/4 teaspoon chili powder
• 1/4 teaspoon pepper
• 1 tablespoon vegetable oil
• 1 1/4 pounds 85 percent lean ground beef
• 1 onion , sliced thin
• 1 teaspoon pepper
• 3/4 teaspoon table salt
• 4 (6-inch) Italian sub rolls , sliced lengthwise with 1 side intact
• 8 slices American cheese (6 ounces)