'To discover the real Devonian you have to talk about food, ' claims Catherine Rothwell in her introduction, and true enough, after a lifetime of collecting authentic local recipes the length and breadth of the country, she finds that this 'beautiful county of fulfilled promise and pleasant surprise' is the spiritual home of so many of Britain's best-known and best-loved dishes. The recipes include Sheep's Head Soup, Salmon Pie, Devonshire Pasty,...