Cornish-Style Pie - Pinch Of Nom

Ingredients

• 2 medium onions (peeled and diced)
• 500 g 5% fat beef mince
• 500 g swede (peeled and chopped into 1cm cubes)
• 3 carrots (peeled and chopped into 1cm cubes)
• 1 large potato (peeled and cut into 1cm cubes)
• 400 ml beef stock (made from 1 beef stock cube and 400ml boiling water)
• 2 tbsp Worcestershire sauce
• 1 tsp Marmite (or other yeast extract)
• 1 tsp dried thyme
• 1 tsp garlic granules
• 140 g pre rolled light puff pastry sheet
• low calorie cooking spray
• salt and pepper to taste