Best way is to use the method described by study to remove the skins. Be sure to then cut out any spots as well remove all stems. Following that, let them drain on a paper towel and when fairly dry, place them on a cookie sheet (Ooops, a biscuit sheet)… anyway you know the kind, about 12 inches wide by maybe 18 to 20 inches long used to bake the biscuits (or our cookies).
Pop the sheet into the freezer. It won't take but about an hour or so to freeze them. I always place them in my vacuum sealer to assure freshness, but you could probably put them in the ziplock freezer bags as well. They will retain their shape and color nicely and make great soups, stews and other such recipes...