- 12 ounces 93%-lean ground beef
- 2 cups finely chopped portobello mushroom caps, gills removed
- 3 tablespoons plain dry breadcrumbs
- 1 tablespoon Worcestershire sauce
- 1 teaspoon chopped fresh thyme
- 1/4 teaspoon salt
- 1/4 teaspoon freshly ground pepper
- 4 slices rye bread
- 1 clove garlic, peeled
- 8 teaspoons pickle relish
- 4 (1/2 ounce) slices Swiss cheese
- Position rack in upper third of oven; preheat broiler. Line a broiler pan with foil.
- Gently mix beef, mushrooms, breadcrumbs, Worcestershire, thyme, salt and pepper in a medium bowl until combined. Shape into 4 patties and place on the prepared pan. Broil until cooked though, 4 to 6 minutes per side.
- Meanwhile, toast bread. Rub each slice of toast with garlic.
- Place 1 patty on each piece of toast, top each with 2 teaspoons relish and cover with a slice of cheese. Remove foil and place the sandwiches on the pan; broil until the cheese is just melted, 30 to 60 seconds.