Ingredients
- 2 Tbsp. butter
- 1 large yellow onion , thinly sliced
- 1/2 tsp. kosher salt
- 1/4 tsp. freshly ground black pepper
- 1 egg
- 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 , halved lengthwise, then cut into 1 1/2-inch pieces
- Chinese hot mustard , or other favorite mustard, for dipping
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