Clean them and put them in a pot of boiling water for 1-2 minutes - this is blanching - it will seal in their green color. After taking them from pot, put them in a ice water bath. Drain, dry them with paper towels, place them on cookie sheets and freeze. Then you can pack them in freezer bags in whatever amount you desire. Be sure to mark bags the dates - when ready to use, prepare as you normally would. Delicious with chopped onions and bacon!