INGREDIENTS
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Kosher salt
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8 cups finely shredded green cabbage (from a 1 1/2-pound head)
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1 cup distilled white vinegar
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1 tablespoon sugar
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2 tablespoons yellow mustard seeds
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Vegetable oil, for frying
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5 large shallots, very thinly sliced crosswise and separated into rings
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1/4 cup Wondra flour (see Note)
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1 1/2 pounds ground beef chuck, preferably 85 percent lean
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1 teaspoon onion powder
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1 teaspoon garlic powder
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1 teaspoon sweet smoked paprika
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1 tablespoon Worcestershire sauce
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Freshly ground pepper
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6 ounces extra-sharp cheddar, shredded
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2 cups baby arugula
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4 brioche buns, split and toasted