Stir together the mayonnaise, mustard, caraway, 1/4 teaspoon of salt and several grinds of black pepper in a small bowl and set aside.
Heat a 2-burner griddle over medium heat. Melt 1 tablespoon of the butter over the surface of the griddle. Add the onions and peppers and season with 1/4 teaspoon salt. Cook, tossing occasionally, until tender and golden, 8 to 10 minutes. Push to one side of the griddle and Scrape the griddle clean.
Combine the beef, Worcestershire and 3/4 teaspoon salt in a medium bowl and mix with your hands to combine. Form into 2 oval patties about 1/2 inch thick each, slightly larger than the size of the slices of toast (they will shrink a little as they cook). Season both sides of the patties with the remaining 1/4 teaspoon of salt and a couple cranks of black pepper.
Melt the remaining tablespoon of butter on the grill over medium to medium-high heat. Add the patties on one side of the griddle and press to flatten with a metal spatula. Cook, flipping once, until browned and almost cooked through, 2 to 3 minutes per side. Meanwhile, lay the Texas toast down on the other side of the griddle. Toast one side, 1 to 2 minutes, then remove to your cutting board.
To assemble, spread the toasted side of 2 pieces of bread with half of the mayo mixture. Add a slice of Swiss cheese to each, then a burger patty. Top with the onion mixture and the American cheese. Spread the remaining mayo mixture on the toasted sides of the last 2 pieces of Texas Toast and top the sandwiches mayo-side down.
Set the sandwiches on the griddle over medium low heat. Toast, flipping once, until the cheese is melted and the bread is crisp and toasty, about 3 minutes per side. Cut in half to serve, with ketchup on the side.
Tools You May Need
Tools You May Need
Price and stock may change after publish date, and we may make money off