INGREDIENTS
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8 ounces ground beef
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2 teaspoons ketchup
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2 teaspoons Dijon mustard
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1/4 teaspoon salt
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1/4 teaspoon freshly ground black pepper
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1 tablespoon extra virgin olive oil
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All-purpose flour for dusting
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1 sheet puff pastry (from a 17.5-ounce package)
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2 ounces cheddar cheese, shredded (about 1/2 cup)
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1 large egg beaten with 1 teaspoon water