Mustard Beef Pot Pie | KARAN BEEF

Ingredients

• 1kg beef goulash
• Olive oil
• 3 leeks, thinly sliced
• 2 carrots, peeled and sliced
• 2 garlic cloves, crushed
• 2 cups beef stock
• 1 400g tinned tomatoes
• 3 Tbsp wholegrain mustard
• 1 tsp mustard powder
• 2 Tbsp balsamic vinegar
• 2 tsp tomato paste
• 2 medium potatoes, peeled and diced
• 3 sprigs rosemary
• 2 bay leaves
• Salt and freshly ground black pepper
• 1 packet puff pastry, thawed
• 1 egg yolk, beaten