Mushroom, chestnut and jamón ibérico wellingtons

By Jose Pizarro From Saturday Kitchen Ingredients For the mushroom, chestnut and jamón ibérico wellingtons 20g/¾oz unsalted butter 2 tbsp olive oil 1 banana shallot, peeled and finely chopped 2 cloves garlic, crushed 200g/7oz seasonal mushrooms, finely chopped 200g/7oz cooked chestnuts, finely chopped …