Wash the broccoli thoroughly
Cut into florets of similar size
Peel and slice the stems if desired
Bring a pot of water to a boil
Prepare a bowl of ice water
Blanch the florets for 2 to 3 minutes
Blanch the stems for 3 minutes if using
Transfer immediately to the ice water
Cool for the same amount of time as blanching
Drain well
Pat completely dry
Spread broccoli in a single layer on a baking sheet
Freeze until solid
Transfer to freezer bags or airtight containers
Remove as much air as possible
Label with the date
Store in the freezer