Roast Beef and French Onion Grilled Cheese
"Nutty, gooey Gruyere is even tastier when melted on top of savory roast beef and sweet, fragrant sauteed onion...."
INGREDIENTS
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1 tbsp. olive oil
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1 small onion
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1 tsp. thyme leaves
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kosher salt
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Pepper
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4 slice rye bread
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1 tbsp. melted unsalted butter or olive oil
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1 tbsp. whole-grain mustard
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2 oz. Gruyère cheese
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2 slice roast beef
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