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The Complete Handbook of Onions
A professional's field guide to selecting, storing, using, and profiting from Allium cepa
by Alumigogo Books
Chapter 1: Understanding Onions
What You Are Actually Buying
An onion is a modified underground stem - technically a tunicated bulb - of the plant Allium cepa. When you purchase a box of onions, you are not buying a simple, inert vegetable. You are buying a living, metabolically active organism that is in a state of suspended animation, waiting for the right environmental cues to resume growth. The single most important fact for a professional to internalize is this: the onion bulb is a survival structure, not a finished product. Its entire biological purpose is to sit dormant through an adverse season and then sprout to produce a new plant. Your job, whether you are a buyer, a chef, or a storage operator, is to keep it in that dormant state for as long as possible, and to understand what conditions will reliably do that.
This chapter lays out the anatomy of that dormancy, the chemistry of flavor, and the physical vulnerabilities that define an onion's behavior in a box, a cold room, or a cutting board. Everything that comes later in this handbook - grading, selection, storage, troubleshooting, and business - hands back to the principles here. If you understand why a sweet onion rots faster than a storage onion, you will never again need to memorize a rule about it.
The Bulb as a Biological System
An onion bulb is a base of hardened, fleshy leaf scales attached to a compressed stem disk at the bottom. The