Remove leaves, discard. Cut off the stems from the broccoli crown and set them aside.
Cut or break off the florets into bite-size pieces. Peel the stem and cut it into small pieces as well.
Wash broccoli florets and stems and drain using a colander.
Bring water and salt to a boil in a large pot on medium-high heat. In the meantime, set up an ice bath and set it aside.
Add broccoli and cook for 1 1/2 to 2 minutes. Remove immediately, drain, and submerge into the ice bath to stop the cooking process.
Prepare a baking sheet lined with parchment paper. Drain broccoli florets and pat dry with a clean towel.
Place florets and stems on the baking sheet and transfer to the freezer for about 3 hours or overnight.
Remove the tray from the freezer and place the broccoli in a ziplock bag or other freezer-safe container.
Freeze for up to 9 months.