Cottage Pie - Pinch Of Nom

Ingredients

• 500 g lean minced beef
• 1 large onion (peeled and chopped)
• 3 large carrots (peeled and chopped)
• 500 ml beef stock (made with 2 beef stock cubes)
• 1 tbsp Worcestershire sauce
• 600 g potatoes (peeled and cut into chunks)
• salt and pepper
• low calorie cooking spray