Mincing vegetables breaks down more cell walls than other cutting methods, leading to a greater release of water during cooking. This can affect the texture and consistency of the final dish.
Vegetables are composed of cells containing water. When you cut a vegetable, you rupture some of these cells, releasing the water they contain. The smaller the pieces you cut, the more cells you break. Mincing, which involves cutting vegetables into very small, uniform pieces, results in significantly more cell damage compared to dicing, slicing, or leaving vegetables whole. This increased cell rupture leads to a greater amount of water being released during the cooking process. This excess water can steam the vegetables instead of allowing them to brown properly, and it can also dilute the flavors of the dish. For example, minced onions will release more water than diced onions when sautéed, potentially leading to a soggy result if not properly managed. The water content of the vegetable itself also plays a role; vegetables with high water content, like cucumbers or zucchini, will release even more water when minced.
If you're mincing vegetables for a dish where excess moisture is undesirable, consider salting the minced vegetables and letting them sit for a few minutes. The salt will draw out even more water, which you can then drain off before cooking. This helps prevent a soggy final product.