INGREDIENTS
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4 large eggs
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1/2 cup milk, room temperature
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1 teaspoon Dijon mustard, plus more for serving
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1/2 cup all-purpose flour
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Kosher salt
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4 ounces coarsely grated Swiss cheese (preferably Jarlsberg), divided
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1/2 teaspoon freshly ground black pepper, plus more
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2 tablespoons unsalted butter
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8 ounces thinly sliced pastrami, divided
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Sauerkraut (for serving)