INGREDIENTS
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4 slices bacon
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1 1/2 pounds ground beef, preferably chuck
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Kosher salt and freshly ground pepper
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Vegetable oil, for the grill
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4 crusty buns, split
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3 tablespoons extra-virgin olive oil
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4 large eggs
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1 tablespoon dijon mustard, plus more for spreading
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1 shallot, thinly sliced
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1 small bunch frisee, torn