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Freezer bags or tubs are your best bet for frozen cauliflower. For convenience, place enough cauliflower in each container to serve as the base for a full meal. For example, if you know you want to make cauliflower soup, you could place 2 - 3 cups of cauliflower in one storage container so you'll have the exact amount you need later.  If you use freezer bags, try to squeeze out most of the air before sealing them. This will help preserve the cauliflower for a longer amount of time. You can also use a straw to suck out the excess air, then press the bag closed when you remove the straw. A foodsaver device or vacuum sealer work well for freezing large amounts of food. Label your bags and place them on a shelf in your freezer. They will keep there for several months. Frozen cauliflower only needs to be reheated for about 90 seconds after the blanching and freezing process. Simply drop the frozen florets into boiling water, or  steam them. They are now ready to use in your favorite cauliflower recipe. Here are a few to try out:    Cauliflower Soup  Cauliflower Gratin  Cauliflower Curry

Summary:
Portion the cauliflower into freezer-safe containers. Freeze the cauliflower. Reheat the cauliflower when you're ready to use it.