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1
Heat a cast-iron griddle until very hot.
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2
Layer the pickle slices on the bottom buns.
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3
Without overworking the meat, loosely form it into 4 balls and place them on the griddle.
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4
Cook the meatballs over moderately high heat for 30 seconds.
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5
Using a sturdy large spatula, flatten each ball into a 5-inch round patty.
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6
Season the patties with salt and pepper and cook for 2 minutes, until well seared.
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7
Press a handful of sliced onions onto each patty.
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8
Using the spatula, carefully flip each burger so the onions are on the bottom.
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9
Top with the cheese and cook for 2 minutes.
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10
Cover with a roasting pan and cook just until the cheese is melted, 1 minute more.
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11
Transfer the burgers with the onions to the buns and sprinkle with umami dust.
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12
Top with the buns and serve.
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13
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14
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