Horseradish is a pretty distinct condiment, but clever chefs find ways to substitute other options in case horseradish isn't readily available, or when cooking for someone who's not a fan of the pungent flavor.
Wasabi
If you're looking for a slight variation on horseradish, reach for some wasabi, which you may know and love as a sushi restaurant staple. But here's a secret: Fresh wasabi, a plant native to Japan with a thick green root, is rarely found in the United States. The green paste sold as wasabi in the U.S. is often an imitation made from strong domestic horseradish root and green food coloring. Use about half the amount of wasabi as horseradish. For example, if you're making cocktail sauce, add 1 tablespoon of wasabi and taste.
Spicy Hot Mustard
Try a spicy hot mustard if you're looking for a different taste but a similar pungency. Choose a type of spicy mustard according to the consistency of the horseradish being replaced. If the recipe calls for horseradish sauce, go for a creamier mustard. If you're substituting for ground horseradish, use a stone-ground mustard. If you need freshly grated horseradish, you may want to use ground spicy brown mustard seeds.
Fresh Ginger
For a less spicy dish, use freshly grated ginger root. If the recipe calls for horseradish oil, substitute similar amounts of ginger oil. To replace prepared horseradish, use slightly more ground ginger.