Ingredients
- 1 cup ketchup
- 1/4 cup packed light brown sugar
- 2 tablespoons balsamic vinegar
- 2 teaspoons Worcestershire sauce
- 1 1/2 teaspoons paprika
- 3 tablespoons canola oil
- 1 pound portobello mushroom caps, gills removed, caps cut into 1/4-inch slices
- 2 cloves garlic, minced
- 1/2 red onion, diced
- 4 kaiser rolls or brioche hamburger buns , split
- 2 cups shredded iceberg lettuce
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