Open-Faced Cheeseburgers with Mushrooms and Onions

Med103367_1207_open_brgr_l

Prep Time 10m Total Time 25m

Ingredients in this Recipe

1 medium red onion, halved and thinly sliced
1 plum tomato, cored and cut lengthwise into 4 slices
1 pound ground beef chuck
1 teaspoon red wine vinegar
10 ounces white mushrooms, trimmed and thinly sliced
2 ounces fontina cheese, cut into 4 slices
2 tablespoons olive oil
4 slices sourdough bread (1 inch thick), toasted
Coarse salt and ground pepper

Recipe Preparation

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