Beef and Ale Pie

WHAT YOU'LL NEED

• 900 g beef stewing steak, cut into large cubes
• 4 onions, chopped
• 2 celery sticks
• 2 tbsp olive oil
• Sprinkle of thyme (optional)
• 500 ml dark ale
• 28 grams Knorr Rich Beef Stock Pot dissolved in
• 500 ml boiling water
• 1 tsp cornflour mixed with 2 tbsp water
• 1 egg, beaten
• 400 g ready made shortcrust pastry