Ingredients
- 1 pound cremini mushrooms (see Cook's Note), cleaned and stemmed
- 1/4 cup extra-virgin olive oil, plus more for the grill grates
- 2 tablespoons soy sauce
- 2 tablespoons sherry or red wine vinegar
- 1 tablespoon Worcestershire sauce
- 3 tablespoons Dijon mustard
- 2 large shallots, sliced into rings
- 12 brioche dinner rolls, split
- 12 small slices Gruyère (about 4 ounces), optional
- 3 tablespoons mayonnaise
- 1 small head green lettuce, torn into roll-size pieces
- 2 plum or Roma tomatoes, sliced into 12 slices
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