blanched

Blanching is a cooking technique in which food—most commonly vegetables, nuts, or fruits—is briefly immersed in boiling water, then immediately transferred to ice water to halt the cooking process. The term "blanched" refers to ingredients that have undergone this treatment. The practice originated in classical French cuisine and is fundamental to professional food preparation. The brief heat exposure denatures surface enzymes, sets color, softens texture slightly, and can facilitate skin removal (particularly from nuts, stone fruits, and tomatoes) without fully cooking the ingredient.

The blanching process typically lasts 30 seconds to several minutes depending on the ingredient's size and density. Ice-bath immersion (called "shocking") is critical, as it stops enzymatic activity that would otherwise continue degrading color, texture, and nutritional quality. Blanched ingredients retain much of their nutritional profile while gaining improved shelf stability and preparation readiness.

Blanching serves multiple culinary purposes across global cuisines. In French cooking, blanched vegetables are foundational to composed dishes, gratins, and vegetable terrines. The technique is essential for preparing vegetables for freezing, as it preserves color and texture during storage. Blanched nuts (particularly almonds) and stone fruits are easily peeled after the ice bath. Blanched leafy greens are used in Italian preparations like pesto or vegetable timbales. Asian cuisines employ blanching before stir-frying or final preparation. The technique also reduces bitterness in certain vegetables (such as bitter greens or cruciferous vegetables) and prepares delicate ingredients for further cooking without overcooking.