Vegan sausage rolls

Name: Vegan sausage rolls
Ingredients: 375g pack ready-rolled vegan puff pastry; 1 tsp olive oil; 200g/7oz leeks (trimmed weight), finely diced; 1 tsp wholegrain mustard; 2 tsp freshly chopped sage (or 1 tsp dried sage); 2 tsp smoked paprika; 100g/3½oz fresh breadcrumbs; 250g/9oz apple sauce (homemade as below or shop-bought); ¼ tsp sea salt; freshly ground black pepper; 1 tsp tamari, for brushing; 4 large apples (Bramley apples are best), peeled, cored and sliced; 1½ tbsp caster sugar; ½ lemon, juice only; ¼ tsp cracked black pepper