Step 1: Peel the horseradish and finely grate it into a mixing bowl or chop it in a food processor fitted with a metal blade. (If using a food processor, cut the horseradish into 1/4-inch thick slices before processing.) Whichever method you use, take care not to breathe the potent horseradish fumes.

Step 2: Stir in the applesauce and cinnamon.

Step 3: The applesauce can be made up to 12 hours ahead. Store it in the refrigerator, covered.