Drain cucumbers-discarding water.
Slice cucumbers-discard ends.
Place slices back in crock.
Add 2 tablespoons of Alum and 2 heaping tablespoons prepared horseradish to crock.
Pour 1 gallon boiling water into crock.
Place your plate and jar back on cucumbers to submerge them under the liquid. Cover let sit overnight.
The next step is quick and easy.