Ingredients

• 1 large egg
• One 14- to 17-ounce box of puff pastry (preferably all-butter), thawed according to package directions
• 2 pounds fully cooked German-style sausage such as bockwurst or bratwurst, halved lengthwise if thick, and cut into 32 pieces (about 2 1/2 inches each)
• 1/3 cup whole-grain mustard
• 1/3 cup drained sauerkraut
• Caraway seeds, for sprinkling

Instructions

1. Preheat the oven to 400°F. Set racks in the upper and lower thirds of the oven. Line two 13x18-inch baking sheets with parchment paper. In a small bowl, beat the egg with 1 tablespoon water. Prep the ingredients for the filling and set aside.
2. If using a 17-ounce puff pastry package, roll each sheet to a 9x12-inch rectangle. Cut each piece lengthwise into eight 1 1/2-inch wide strips. Cut each strip crosswise into two pieces, about 4 1/2 inches long. You should have 32 pieces of pastry.
3. Spread the center of each piece of pastry with 1/2 teaspoon mustard and top with 1/2 teaspoon sauerkraut. Brush one narrow end of the pastry with egg wash, add one piece of sausage, and roll to enclose. Return to parchment-lined baking sheets. Brush the top of each pastry with egg wash and sprinkle with caraway seeds, seam-side down. Chill in refrigerator for 15 minutes. Bake until golden brown and puffed, 23 to 27 minutes.