Gorgonzola Burger

Name: Gorgonzola Burger
Prep time: 25 min
Cook time: 10 min
Total time: 35 min
Yield: 2
Cuisine: american
Ingredients: 2 tablespoons butter; 2 red Onions; 2 tablespoons sugar; 2 tablespoons balsamic vinegar; Salt; 400 grams ground beef; Black pepper; 100 grams of gorgonzola cheese; 4 Burger buns; Tomato slices; Leaves of Arugula

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