Rhubarb is a high-water-content plant, which means ice crystals are its natural enemy. When you freeze raw stalks, those crystals rupture cell walls, turning your crisp rhubarb into a bit of a mushy mess upon thawing. That’s perfectly fine for sauces, jams, or crumbles, but don’t expect to use frozen rhubarb in a crunchy salad.
To keep it at its best, blanch the stalks for about one minute before freezing. This deactivates the enzymes that cause browning and loss of flavor. Or, if you’re feeling lazy (no judgment), you can flash-freeze raw chunks on a baking sheet first, then bag them.
Here’s a fun fact: in the 1800s, people called rhubarb “pie plant” because that was its main culinary use. Freezing is just modern alchemy—turning that plant into a July moment in February.
