Volcanic Applesauce

• 1 piece (1 to 2 inches long and 1 to 1½ inches across; about 2 ounces)

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 the food processor, cut the horseradish into ¼-inch-thick slices before processing.) Whichever method you use, take care not to breathe the potent horseradish fumes. Stir in the applesauce and cinnamon. The applesauce can be made up to 12 hours ahead. Store it in the r