Vegan sausage rolls - Good Food Middle East

Ingredients

• 250g chestnut mushrooms
• 3 tbsp olive oil
• 2 leeks, finely chopped
• 2 large garlic cloves, crushed
• 1 tbsp finely chopped sage leaves
• 1 tbsp brown rice miso
• 2 tsp Dijon mustard
• 30g chestnuts, very finely chopped
• 70g fresh white breadcrumbs
• 1 x 320g sheet ready-rolled puff pastry (not the all-butter version)
• plain flour for dusting
• dairy-free milk (like soya milk), to glaze