Corned Beef and Cabbage Turnovers

Bahan-bahan (9 porsi)

• 2 tablespoons canola oil
• 1 medium (about 1 cup) sweet onion, (finely chopped )
• 4 cups (12 ounces) coleslaw mix, ((shredded cabbage & carrot))
• ½ pound cooked corned beef, (chopped finely)
• salt and pepper, (to taste)
• 2 sheets (one 17.3 ounce box) frozen puff pastry, (thawed)
• 1 large egg
• ½ cup mayonnaise
• 2 tablespoons Dijon mustard