Ingredients
- 1 1/2 pounds ground chuck
- 2 to 3 dashes Worcestershire sauce
- Kosher salt
- Freshly ground black pepper
- 8 Portobello mushrooms, stemmed and cleaned
- 1 tablespoon olive oil
- 1/2 cup freshly grated Swiss cheese
- Drizzles of Dijon mustard
- 4 butter lettuce leaves
- 8 tomato slices
- 1/2 cup crispy jalapeños (such as French's)
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