Terrine en Tarte

This terrine, made like a tart in a herb pastry case, deserves much praise both for taste and versatility. With its glossy topping of walnuts it makes a handsome first course or part of a cold meal and it is perfect for a sophisticated picnic, as you can easily eat the slices in your fingers. The terrine is a mixture of pork and turkey breast and the addition of tuna fish is indefinable but adds marvellously to the flavour. (As the terrine can be made well ahead it is also a useful buffet p