Place 6-8 cups of water in a large pot and bring to a rolling boil. While the water is heating up, clean out the outside of the sprouts of any bad leaves or bad spots. Do not remove the stems.
Make an ice bath in a separate bowl – 6 cups of water and 3 cups of ice. You want lots of ice!
Line a rimmed baking sheet with a few sheets of paper towels.
Once the water is boiling, carefully put the sprouts in the water and cook for exactly 4 minutes. Using a large slotted spoon, scoop out the sprouts and place them in the ice water bath. Allow the sprouts to sit in the ice bath for 1 minute.
Drain in a colander, shake off any excess water, and pour the sprouts onto the paper towel-lined pan. Using another paper towel, pat the sprouts dry. Once the sprouts are completely dry, place them in a freezer-safe bag and store them in the freezer. These last ~10 months frozen