Incorrect dicing, resulting in uneven sizes, leads to inconsistent flavor release, with larger pieces releasing flavor slower and smaller pieces releasing it faster and potentially burning. Finely diced onions release their flavor more uniformly and quickly, allowing for even distribution throughout the dish.
When you dice an onion, you're essentially breaking down its cell walls, which contain flavor compounds. The smaller the dice, the more cell walls you break, and the more flavor is released. Finely dicing an onion maximizes the surface area exposed, leading to a rapid and even release of its pungent flavor. This is ideal when you want the onion flavor to permeate the entire dish quickly and uniformly.
Incorrect dicing, on the other hand, creates a mix of large and small pieces. The smaller pieces will release their flavor quickly and may even burn if cooked for too long, resulting in a bitter taste. The larger pieces will release their flavor much slower, potentially leaving some parts of the dish under-seasoned and others over-seasoned. This inconsistency can significantly impact the overall taste and texture of your dish. Furthermore, unevenly sized pieces cook at different rates, leading to some pieces being perfectly cooked while others are either undercooked and crunchy or overcooked and mushy.
To ensure even dicing, first halve the onion from root to stem, then peel each half. Make horizontal cuts almost to the root, then vertical cuts, and finally dice across. This creates uniform pieces and minimizes uneven flavor release.