Serving and Storing - This soup can be eaten immediately once it’s ready. It just takes about 20 minutes to cook the cauliflower. Serve with vegan bacon, fresh chives, and freshly ground pepper. Leftover soup can be stored in the refrigerator for up to 3 days or in the freezer for up to 1 month. To serve frozen soup, let it thaw overnight in the refrigerator. Once it’s mostly thawed, gently reheat the soup in a small soup pot.