Beef stew with puff pastry

Ingredients

• 500 gram beef stew meat
• 2 carrots
• 1/2 celery root
• 1 leek
• 1/2 red bell pepper
• 1 onion
• 5 garlic cloves
• 2 sprigs of rosemary
• 100 ml Brandy
• 10 square puff pastry sheets
• 1 egg
• 2 tablespoons all-purpose flour
• pepper and salt to taste