Prepare the dried seaweed by soaking and rinsing well. Boil water in a small pot, and add salt. Blanch the soaked seaweed briefly. Drain and rinse with cold water. Drain again, squeeze out excess water, and cut into bite size pieces.
In a medium size bowl, gently toss the vegetables with the seasoning ingredients. Set aside. You can make ahead up to this point several hours or a day before, if desired.
Mix in cold water and season with salt. Start with a half teaspoon of salt, taste and add more if necessary. Refrigerate to chill. Serve in chilled bowls with some ice cubes.