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1
Heat grill to high and add a cast iron pan on grill grates to preheat.
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2
Place a cast iron pan on the grill.
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3
Divide the meat into 4 equal portions (8-ounces each).
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4
Form each portion loosely into a 3/4-inch burger and make a deep depression in the center with your thumb.
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5
Brush each burger with oil and season with salt and pepper on both sides.
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6
Place the burger in the cast iron pan, or directly on the grill, until slightly charred on both sides and cooked to desired doneness.
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7
Brush the burgers with the BBQ sauce and add 2 slices of cheese to each burger during the last minute of cooking.
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8
Close the lid to melt the cheese.
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9
Place the burgers onto the toasted buns.
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10
Top each with bacon, onion rings, and top bun.
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11
Skewer with wooden skewer, if needed.
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12
Heat the oil over medium-high heat in a heavy-bottomed medium saucepan.
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13
Add the onions and cook until soft, 3 to 4 minutes.
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14
Add the garlic and cook for 1 minute.
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15
Add the ketchup and water, bring to a boil and simmer for 5 minutes.
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16
Add the remaining ingredients, salt and pepper, to taste, and simmer for an additional 10 minutes until thickened, stirring occasionally.
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17
Transfer the mixture to a food processor and puree until smooth, season with salt and pepper, if necessary.
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18
Pour into a bowl and allow to cool at room temperature.
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19
Sauce will keep for 1 week, in the refrigerator, stored in a tightly sealed container.
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20
Heat the oil in a large saucepan over medium heat until it reaches 360 degrees F on a deep-fry thermometer.
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21
Line a baking sheet with paper towels and set aside.
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22
While the oil is heating, put the buttermilk in a large baking dish and season liberally with salt and pepper.
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23
Divide the flour between 2 large baking dishes and season both dishes liberally with salt and pepper and cayenne.
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24
Working in batches, dredge some of the onion rings in 1 of the dishes of flour and tap off the excess.
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25
Dip the rings in the buttermilk and allow excess to drain off and then dredge the rings in the second dish of flour making sure to coat the rings evenly.
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26
Tap off excess and put into the hot oil.
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27
Fry the rings until golden brown and tender, turning once or twice, about 4 minutes.
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28
Remove with a slotted spoon and drain on the baking sheet lined with paper towels and season with more salt.
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29
Repeat with remaining onion rings.