INGREDIENTS
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4 burger buns, lightly toasted
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2 tablespoons olive oil
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1 large red onion, thinly sliced
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1 jalapeño pepper, thinly sliced
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1 teaspoon sugar
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2 tablespoons butter
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1.5 pounds ground beef
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1/2 tablespoon brown sugar
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1 tablespoon sriracha hot sauce
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1 tablespoon Worcestershire sauce
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3 cloves garlic, minced
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Salt and freshly ground black pepper
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3 ounces blue cheese, crumbled
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4 ounces sharp cheddar, shredded