1 slice whole wheat or white bread, broken into small pieces
2 tablespoons red wine vinegar
1 tablespoon liquid smoke
2 teaspoons Worcestershire sauce
1 teaspoon hamburger or steak seasoning
1/4 to 1/2 teaspoon garlic salt
1/4 to 1/2 teaspoon pepper
1/4 cup all-purpose flour
4 onion hamburger buns, split
4 Bibb or Boston lettuce leaves
1/3 cup prepared Thousand Island salad dressing
4 slices process American cheese
4 slices red onion
1 large heirloom tomato, sliced
Combine first nine ingredients; mix lightly. Shape into four 3/4-in.-thick patties. Press patties into flour to lightly coat both sides.
In a large cast-iron or other heavy skillet, cook burgers over medium heat until a thermometer reads 160°, 4-5 minutes per side. Layer bun bottoms with salad dressing, lettuce, burgers, cheese, onion and tomato slices. Replace bun tops.