Pigs in a Blanket
2 tablespoons butter
1 large yellow onion, thinly sliced
1/2 teaspoons kosher salt
1/4 teaspoons black pepper
1 9- by 9-inch piece, frozen all-butter puff pastry dough, thawed but still very cold
4 5-inch pork hot dogs or beef hot dogs
Chinese hot mustard, or other favorite mustard, for dipping
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