Butternut, feta and chilli rolls

Ingredients

• 1kg butternut squash (unpeeled), halved and deseeded
• olive oil
• 2 teaspoons chilli flakes
• 1 teaspoon ground cinnamon
• 1 fat garlic clove, crushed
• 200g feta cheese, crumbled
• 1 small packet (about 30g) of flat leaf parsley, finely chopped
• 1 x 320g ready-rolled all-butter puff pastry sheet
• 1 egg, beaten
• 1 teaspoon nigella seeds
• Maldon sea salt flakes and freshly ground black pepper