Butternut squash, onion and chestnut tarte fine

By Bryn Williams From Saturday Kitchen Ingredients For the dressing 500ml/18fl oz vegetable oil ½ tbsp white peppercorns, lightly crushed ½ shallot, peeled and chopped 100ml/3½fl oz white wine vinegar 25g/1oz Dijon mustard 25g/1oz English mustard 10g/⅓oz salt For the butternut, onion and …