each onion cut into thin rings

The onion (Allium cepa) is a bulbous perennial plant in the amaryllis family, native to Central Asia and cultivated worldwide. The edible bulb consists of concentric layers of modified leaf bases that form tight, papery-skinned orbs ranging in color from white to yellow, red, or purple depending on the cultivar. Onions possess a pungent, sulfurous flavor profile that mellows and sweetens considerably with heat; raw onions are sharp and tear-inducing due to volatile sulfur compounds released when cell walls are damaged. Key cultivars include sweet varieties (Vidalia, Maui), storage types (Yellow Spanish), and red varieties prized for both flavor and color.

Onions serve as a foundational aromatic in cuisines worldwide, appearing in mirepoix and soffritto bases, caramelized applications, and as a primary component in dishes from French onion soup to Indian curries. Thinly sliced or "rung" onions are particularly valued for their extended surface area, which promotes rapid cooking, even caramelization, and integration into dishes. Ring-form onions are central to garnishes, fried onion preparations, sandwich applications, and raw salads where their thin profile ensures tender texture and uniform cooking. Proper slicing across the equator of the bulb, perpendicular to the layers, yields intact rings ideal for frying, baking, and presentation.