Spicy Chorizo Squash Parcels

Name: Spicy Chorizo Squash Parcels
Ingredients: 500g/1lb (2 oz) butternut squash, peeled, cored and cut into ¾in cubes (450g/1 lb when peeled and cored); 3 tbsp olive oil; 30g (1 oz) fresh thyme; 1 large white onion, finely chopped; 2 garlic cloves, crushed; 50ml (2 fl oz) white wine (preferably Sauvignon Blanc); 100ml (3½ fl oz) chicken stock (from 1 stock cube); 200g (7 oz) cooking chorizo, cut into ¾ in cubes; sea salt and freshly ground black pepper; cornflour, for dusting; 4 sheets ready-made filo pastry; 75g/2½ oz unsalted butter, melted