Steak and Mushroom Pie - Pinch Of Nom

Ingredients

• low-calorie cooking spray
• 400 g lean diced stewing steak
• 2 onions, (peeled and diced)
• 250 g mushrooms, (quartered)
• 300 ml boiling water
• 1 beef stock cube
• 1 tbsp red wine vinegar
• 2 tbsp Henderson's relish or Worcestershire sauce
• 1 tbsp tomato puree
• 1 beef stockpot
• 1 tsbp cornflour
• 1 tbsp cold water
• 2 sheets ready rolled filo pastry, ((approx 45g per sheet))