Steak Sandwich with Horseradish Chive Havarti

Number of Servings: 2
Ingredients:
1 tablespoon vegetable oil
1 large red onion, sliced
2 tablespoons sherry vinegar
Salt and pepper, to taste
2 tablespoons butter
2 crusty sandwich rolls, split, lightly toasted, and buttered
1 six-ounce top sirloin steak, grilled medium rare and sliced into 1⁄4 inch slices
4 slices
Horseradish Chive Havarti
Cooking Directions:
In a medium skillet, heat oil over medium-low heat and sauté onions until soft, lightly browned, and caramelized. Turn heat to medium-high; add vinegar, salt, and pepper. Cook until most of the vinegar has evaporated.
Evenly layer bottom halves of rolls with steak and onions. Top with Horseradish Chive Havarti.
Place sandwiches in a hot oven or under broiler until cheese is melted. Top with remaining rolls.