Deli Bourekas

Ingredients

• 3/4 pound chopped, cooked corned beef
• 1 cup sauerkraut, drained of all brine
• 1 medium potato, cooked, peeled and diced
• 1 large carrot, peeled and then cooked until just tender, diced
• ground black pepper to taste
• 6 T. Dijon mustard, extra for serving, this is optional if you don't care for mustard
• 2 pounds puff pastry sheets
• 1 egg, beaten
• 2 T. caraway seeds