Parsnip and potato mash

Requires:

750g/1½ lb potatoes, peeled and chopped
225g/8oz parsnips, peeled and chopped
75g/2½oz butter
55ml/2fl oz milk
Salt and pepper

Method:

To make the parsnip and potato mash, place the parsnip and potato into a pan of boiling water and boil for 10 minutes, or until soft.  Add the butter, milk, salt and freshly ground black pepper and mash until smooth.