INGREDIENTS
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2 teaspoons butter
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1 teaspoon vegetable oil
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2 Spanish onions (about 1 pound), halved and thinly sliced
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1/4 teaspoon sugar
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1/4 teaspoon sea salt
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1 tablespoon sherry vinegar
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1/2 teaspoon minced fresh thyme
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3 applewood-smoked bacon strips
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3/4 cup (3 ounces) shredded Gruyère cheese
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1/2 cup sour cream
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1/2 cup mayonnaise
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1/4 teaspoon freshly ground black pepper