Place the assorted sliced radishes in a medium mixing bowl with the mint, cilantro and radish sprouts. Add the yuzu juice and mirin and toss until well combined. Divide the salad equally to the center of 4 chilled plates. Shingle 4 slices of tuna over each mound of salad. Drizzle some Wasabi-Yuzu around the radish salad on each plate. Finish by sprinkling a light amount of sea salt over the tuna slices.
Combine all the ingredients in the cup of a hand-held blender. Blend until smooth.
1/2 cup (leftover sauce can be reserved for another use)