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1
For Paul's burger sauce: In a medium bowl, whisk together all of the sauce ingredients.
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2
For the burgers: Heat a large cast-iron skillet over medium-high heat until almost smoking.
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3
Add about 1 tablespoon of oil and 1 tablespoon of the butter to the skillet.
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4
When the butter has melted, working in batches, open the buns and toast them in the skillet until they are golden brown.
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5
Wipe out the skillet and reheat it over medium-high heat.
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6
Season the burger patties with salt and pepper.
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7
Working in batches and using more of the oil and butter, place some of the burger patties in the skillet (do not crowd the pan).
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8
Cook until the burgers are well seared (about 3 minutes) and flip.
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9
Place a slice of cheese on each burger and continue to cook the burgers for 2 minutes longer.
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10
Cover the skillet to melt the cheese and steam the burgers.
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11
Continue until all the burgers are cooked, adding more oil and butter to the skillet between batches as necessary.
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12
Spread each side of the buns with about 2 teaspoons of Paul's burger sauce.
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13
Season the tomato slices with salt and pepper and place the tomatoes on the bottoms of the buns.
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14
Place the cooked burger patties on top of the tomatoes and then top the burgers with shredded lettuce.
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15
Secure the tops of the buns on the burgers with frilled toothpicks or small bamboo skewers.
