Look at any recipe for a savory dish and chances are it will start with this step: fry onions in a pan over medium heat. Onions--and their allium family relatives, shallots, garlic, chives, and leeks--are one of the most heavily used ingredients in cuisines all over the world. You'll rarely find them in the spotlight, though--except for when they are fried into rings or used to repel vampires. In this book, Martha Jay gives alliums their due, offering an illuminating history of these cherished plants that follows the trail of their aromas to every corner of the globe and from ancient...