Wasabi is similar, but I assumed the reason you wanted to replace it is because you don't like the taste and wasabi is just as if not more divisive than horseradish. Plus getting quality horseradish is easier than getting quality wasabi.
Toothworts, also known as Crinkleroot, are one of my favorite edible plants of later winter and early spring. The leaves, and even more so, the roots have a sharp, peppery taste resembling Horseradish. In fact, you can even make a pretty good Horseradish substitute for Chinese hot mustard. A very hot tea of the leaves or roots can be used as a diaphoretic to heat the body and cool fevers. Toothworts can be found all over the place under Maples, Poplars and other deciduous trees. You will find it growing with the Hepaticas, Trilliums and other hardwoods loving plants. In my area, these plants come up in late Fall and hang around all winter. In early Spring, they will bloom and continue to be available to the forager until late Spring to early summer. On of my favorite trailside spices, Toothworts are a welcome addition to a pot of soup or even as a hot condiment on sandwiches.
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