Clean, peel, and cut down roots to a manageable size.
Grind up the roots using a hand grater, blender, Cuisinart, or grinder. Don’t grind too fine, you want a little texture in the final product. You should have about 4 cups of ground root.
Add the vinegar, water, and salt to the horseradish.
Mix thoroughly.
Fill each Ziploc bag with 1 cup of the horseradish.
Place your bags in a larger Ziploc bag or add the bags to a plastic container to contain the fumes.
Freeze and store the horseradish for up to 1 year (it will lose some potency).
Notes
I call for 5-6 cups roots, once ground this should be about 4 cups. However, If you have extra horseradish add the following per 1 cup of horseradish: ¼ cup white vinegar, ¼ cup water, ¼ teaspoon salt.