Red Onion Burger

Ingredients

• 2 onions
• 1 tbsp plant oil
• 1 tbsp balsamic vinegar
• 1 tbsp sugar
• 4 ciabatta rolls
• 4 lettuce leaves (e.g., endive)
• 2 Tomatoes
• plant oil (for grilling)
• 500 g ground beef
• Salt
• Pepper (freshly ground)
• 4 slices cheddar

Instructions

1. 1.

   Peel the onions and slice them into thin rings. Gently steam in hot oil until softened, then deglaze with balsamic vinegar, sprinkle sugar, and caramelize.

2. 2.

   Halve the rolls. Wash the lettuce leaves, dry, and cut into fine strips. Slice the tomatoes after removing the stem ends.

3. 3.

   Preheat the grill and brush it with oil.

4. 4.

   Season the ground beef with salt and pepper, mix well, shape into four patties, and grill one side for about 4 minutes. Add a slice of cheddar to each patty and grill another 4 minutes. Assemble the burgers by layering lettuce, tomato slices, patties, and caramelized onions on the rolls, close with the tops, and serve immediately.