Name: Onion burgers
Prep time: 5 min
Cook time: 10 min
Yield: 4
Cuisine: American
Ingredients: 500g lean ground beef; 2 to 3 tbsps all-purpose flour; 1 tin French onion soup; American mustard; Mayonnaise; White or whole-wheat bread or buns; 1 medium onion, cut into rings