Vegetarian sausage rolls - Good Food Middle East

Ingredients

• 200g chestnut mushrooms
• 3 tbsp olive oil
• 2 leeks, finely chopped
• 2 large garlic cloves, crushed
• 1 tbsp sage, finely chopped
• 1 tbsp brown rice miso
• 2 tsp Dijon mustard
• 30g chestnuts, very finely chopped
• 60g mature cheddar, grated
• 70g fresh white breadcrumbs
• 1 x 320g sheet ready rolled all butter puff pastry
• 1 medium egg, light beaten to glaze