Ingredients
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2 tbsp butter, divided
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2 cups thinly sliced yellow onions
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1/2 tsp salt divided
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1/2 tsp ground black pepper divided
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1/2 cup mayonnaise
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1 1/2 tsp minced garlic
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1 1/2 tbsp lemon juice
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1 lb ground beef (85% lean), molded into 4 patties
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4 slices smoked Gouda cheese
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1 small tomato
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4 Kaiser rolls
Steps
1
Melt 1 ½ tablespoons butter in a large sauté pan over medium-low heat. Add the onions, 1/4 teaspoon each, salt and pepper, and allow to cook, stirring occasionally, until they are deep golden brown and caramelized, about 25 minutes. Add a little water if the onions start to brown too quickly. Remove from the pan, and let cool.
2
While onions are cooking combine mayonnaise, garlic, lemon juice and remaining 1/4 teaspoon salt and pepper, stirring until well mixed. Refrigerate until ready to use.
3
Preheat grill for medium heat and lightly oil the grate.
4
Cook patties on the preheated grill until burgers are cooked to your desired degree of doneness, about 3-4 minutes per side for medium-well burgers to an internal temperature of 160°F.
5
Place a slice of cheese on each burger, close grill lid and allow cheese to melt. Remove burgers.
6
Spread garlic mayonnaise (aioli) onto each burger bun bottom. Place one grilled burger onto each bun, top with caramelized onions and a slice of tomato. Place top of bun on burgers.
