Blanching sets color, softens leaves just enough for salads, and prepares spinach for freezing by inactivating enzymes that cause quality loss. Use a large pot of rapidly boiling salted water and an ice bath to stop the cook instantly.
Basic blanching steps:
Notes for freezing: dry the spinach as much as possible, portion into airtight containers or freezer bags, label with date, and freeze flat. For salads: after chilling, pat leaves dry and use in composed salads or dress lightly to keep texture.
Blanching time depends on leaf size; baby spinach needs closer to 30 seconds while mature leaves may take the full minute. This method keeps color, flavor, and nutrients intact.