Non-fiction books need good ideas just as much as fiction. Well, not quite, but you need to tell a story, nevertheless. Food lends itself to great storytelling – Elizabeth David revolutionised foodwriting in Britain, as Julia Child did in the USA. They wrote about far more than the recipes, as now all good food writers do.
Here’s an article in the Guardian, posted by Wendy Collinson on facebook, which will give you some clues about how to approach your food story.