Lentil Shepherds Pie - Cooking Them Healthy

Ingredients

• 1 onion, chopped
• 1 carrot, finely chopped
• 1 parsnip, finely chopped
• 1 stick celery, finely chopped
• ½ red pepper, finely chopped
• 1 clove garlic
• 1 tbsp tomato puree
• 350ml fresh chicken stock, ideally homemade (or veg stock, if vegetarian)
• 200g puy lentils
• 1 x 400ml plum tomatoes
• 1 tbsp Worcestershire sauce (choose vegetarian and gluten free, if needed)
• 500g mashed potato