Grilled Gruyère And Marinated Onion Sandwich
Ingredients
- 1/2 cup Spanish or brown onion, very thinly sliced
- 1/4 teaspoon kosher salt
- 1/4 teaspoon freshly ground black pepper
- 1 tablespoon best-quality olive oil
- 1 tablespoon white wine vinegar
- 4 slices country white bread
- 4 tablespoons salted butter, melted
- 5 ounces Gruyère cheese, coarsely grated
- 4 teaspoons stone-ground mustard
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