Lunch: Roast Beef and French Onion Grilled Cheese

Recipe by Woman's Day Kitchen Nutty, gooey Gruyère is even tastier when melted on top of savory roast beef and sweet, fragrant sautéed onion.

Ingredients

1 tbsp. olive oil
1 small onion
1 tsp. thyme leaves
kosher salt
Pepper
4 slice rye bread
1 tbsp. melted unsalted butter or olive oil
1 tbsp. whole-grain mustard
2 oz. Gruyère cheese
2 slice roast beef

Instructions

Heat olive oil in a medium skillet over medium heat. Add onion, season with 1/4 teaspoon each salt and pepper, and cook, covered, stirring occasionally, for 12 minutes. Reduce the heat to medium-low, stir in thyme leaves and cook, uncovered, stirring occasionally, until the onions are golden brown, 15 to 20 minutes more (add 1 tablespoon water to the skillet if the onions start sticking).
Brush one side of each slice of bread with butter or oil. Form sandwiches with the bread, whole-grain mustard, Gruyère cheese, roast beef, and the onion mixture. Cook the sandwiches, covered, until the bread is golden brown and crisp and the cheese has melted, 4 to 5 minutes per side.

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