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Use salt,and mix it with brown sugar.
Milk the worm of the sand soon after you have pumped them, (as this is the time the worm is softer)
Sprinkle the mix over and roll the worm in the mix, wrap each worm in wet newspaper strips, then roll the worm in the paper, packing one ontop of the other or as you wish and stash them in the freezer.
Yes it does go kinda black.