In a medium bowl, whisk together flours, sugar, soy sauce, sherry wine, salt, egg, scallions and garlic until well combined. Add chicken and marinate in the fridge, covered, several hours or overnight.
(Once chicken has marinated) Prepare a cooling rack set over paper towels on a baking sheet.
To shallow fry chicken, heat about ¼" of oil in the bottom of a large, deep sided skillet over med to med-high heat until shimmering. Add chicken pieces in batches (chopsticks work lovely for this task) -- being careful not to crowd the pan -- and fry until deep golden brown and crisp on the edges, about 3-4 mins per side. Remove to cooling rack to drain. Repeat with remaining batches. Allow chicken to cool.
While chicken cools, combine mayo, sour cream, lemon juice and umeboshi in a small food processor and blend until smooth.
To serve tacos, layer warm tortillas with umeboshi mayo, warm chicken, veggies, cilantro and chives. Top with salsa, furikake, a squeeze of lemon and more umeboshi mayo. Enjoy!
Notes
Cooking time does not include the suggested marinating period in the fridge (either several hours or overnight, depending on how much time you've got). But trust me -- it's worth it! Any leftover chicken is also delicious served hot or cold with rice, furikake and more umeboshi pickles the next day. Yum!
Recipe by the pig & quill at https://thepigandquill.com/mochiko-chicken-tacos-with-tangy-umeboshi-mayo/