INGREDIENTS
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4 slices bacon, chopped
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1 large onion, chopped
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1 teaspoon hot sauce, plus more to taste
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1 teaspoon sugar
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1/2 teaspoon red wine vinegar, plus more for drizzling
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Kosher salt and freshly ground pepper
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1 1/4 pounds ground pork
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2 teaspoons extra-virgin olive oil, plus more for drizzling
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4 slices Swiss cheese
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4 hamburger buns, split and toasted
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1 romaine lettuce heart, thinly sliced
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2 medium tomatoes (1 sliced, 1 chopped)