"F&W's Grace Parisi reinvents the classic grilled cheese. More Grilled Cheese Recipes ..."
INGREDIENTS
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3 tablespoons unsalted butter, softened
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1 tablespoon extra-virgin olive oil
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1 large onion, halved and thinly sliced crosswise (4 cups)
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Salt and freshly ground pepper
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Eight 1/2-inch-thick slices of whole-grain bread
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Dijon mustard
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8 ounces imported Gruyère cheese, thinly sliced
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2 half-sour pickles, thinly sliced lengthwise