1. With a mandolin slicer, shred daikon to thread pieces. 2. Soak shredded daikon in cold water for 5-10 minutes to get the crunchy texture and get rid of the bitter flavor. 3. Cut mizuna into 3 inches. 4. Chiffonade (Roll and thinly chop) shiso leaves. 5. Combine all the salad ingredients in a bowl and toss it all together. 6. Remove the seed from umeboshi (pickled plum) and chop into small pieces. 7. Combine all the dressing ingredients in a small bowl and whisk all together. 8. Serve chilled. Sprinkle katsuobushi (bonito flakes) and ikura (salmon roe) if you like. Pour the dressing when you are ready to serve.