inactivate enzymes that cause the development of offflavors
and off-colors during frozen storage. Some
exceptions include onions, leeks, and peppers because
they lose flavor and color on blanching. Blanching
removes trapped air (e.g., in broccoli florets) and
metabolic gases within vegetable cells and replaces them
with water, forming a semicontinuous water phase that
favors a more uniform crystal growth during freezing.