Classic Smashed Cheeseburger

INGREDIENTS:

1 1/2 pounds Certified Angus Beef ® ground beef, 80/20 lean

1/2 cup mayonnaise

1 tablespoon yellow mustard

1 tablespoon grated yellow onion

2 teaspoons hot sauce

1 teaspoon Worcestershire sauce

4 white hamburger buns

2 tablespoons butter, room temperature

1 1/2 teaspoons kosher salt

1/2 teaspoon pepper

4 slices American cheese

2 cups shredded iceburg lettuce

8 slices vine-ripe tomatoes