Beet Salad with Horseradish

Beets are earthy and sweet; horseradish is earthy and seismic; the combination is fortuitous. Fresh horseradish is best, but you can substitute prepared horseradish if necessary (make sure the jar hasn’t been opened for too long, or the horseradish will have lost its intensity). This salad is best after marinating in the refrigerator for a day or two, so prepare it ahead of time if you think of it.