Place broccoli seeds in strainer and rinse in plenty of clear cool water.
Drain seeds, transfer to large bowl, and soak for six to 12 hours, or overnight, in water that is roughly 60 to 70 F, or lukewarm to the touch.
Move seeds around in the water and make sure they are all submerged, as they have a tendency to float on the surface.
Fold a paper towel sheet to fit your sprouting container, and spread a single layer of wet broccoli seeds across the bottom, using as many containers as you need for the amount of seeds you have.
Cover the containers with perforated lids or cover with plastic wrap and poke several small holes for ventilation.
Place containers in a warm area that is roughly 65 to 75 F.
On the fourth day, move the sprouts to a brighter area, but keep out of direct sunlight.
Pick sprouts on the fifth or sixth day by removing the clump from the container and submerging it in a large bowl of cool water.
Move the sprouts around in the water to separate them and to loosen the large hulls, or seed casings, that are still attached to the leaves.
Discard hulls, rinse sprouts again, drain, and store uncovered at room temperature to allow excess moisture to evaporate.
Transfer to plastic bags or other containers and refrigerate.