French in a Flash Super Bowl: Hotdog Vol au Vent

Ingredients

• 1 sheet (1/2 box) frozen puff pastry, thawed but cold
• 1 tablespoon canola oil
• 1 1/2 yellow onions, finely sliced on a mandoline
• 3/8 teaspoon granulated sugar
• Kosher salt
• 1 tablespoon dijon mustard
• 4 hot dogs, cut into thirds
• 1 egg, beaten with a splash of water
• Poppy seeds (optional)
• Fleur de sel

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