5/5
(1 Votes)
Ingredients
- 2 Tbsp. olive oil
- 1 large sweet onion, halved and thinly sliced (about 3 cups)
- 4 prepared hamburger patties
- 2 Tbsp. mayonnaise or salad dressing
- 1 tsp. prepared yellow mustard
- 4 1/2-inch slices ciabatta bread, toasted
- 1 cup fresh baby spinach leaves
- 2 Tbsp. steak sauce
Preparation
Step 1
1. In large skillet heat olive oil over medium-high heat. Add onion slices and cook 8 to 10 minutes or until very tender, stirring frequently.
2. Meanwhile, prepare burgers according to package microwave directions.
3. In small bowl combine mayonnaise and mustard; spread mixture on one side of each bread slice. Top bread with spinach and burger. Stir steak sauce into cooked onions. Spoon onion mixture on burgers. Makes 4 servings.
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