Sausage rolls recipe

Ingredients

• 30 g butter, plus extra for greasing
• 1 leek, finely chopped
• 1 carrot, coarsely grated
• 400 g minced (ground) pork and veal
• 1 tsp mixed dried herbs
• 1 tbsp Worcestershire sauce
• 2 sheets (24cm/9.5inches square) shop-bought puff pastry
• 1 handful plain (all-purpose) flour, for dusting
• 1 egg
• 2 tbsp whole (full-fat) milk
• 1 pinch each salt and pepper
• 1 amount of tomato sauce, to serve (optional)