When John Montagu, the fourth Duke of Sandwich, got the brilliant idea of putting slices of cold meat between two pieces of bread, he not only invented the first, really modern meal - he created a global obsession. Today there are variations of the portable, cheap (but, above all, good) sandwich in most cultures and it is about time a book appeared that takes the subject seriously. In more than 90 recipes, you learn such skills as how to make perfect versions of classics, and you get to know a bit more about exotic sandwiches.