01 - Combine chicken pieces with soy sauce, sake (if using), and grated ginger in a bowl. Let marinate for 10 minutes to absorb flavors.
02 - Whisk together flour, baking powder, and salt in a large bowl until evenly combined.
03 - Beat eggs in a separate bowl, then add dashi stock (or water) and mayonnaise. Mix until smooth and incorporated.
04 - Pour wet mixture into dry ingredients and stir until just combined. Small lumps are acceptable—avoid overmixing for tender texture.
05 - Fold shredded cabbage, spring onions, and grated carrot into batter until evenly distributed throughout.
06 - Heat large non-stick skillet or griddle over medium heat. Lightly oil the surface to prevent sticking.
07 - Add marinated chicken pieces to pan and cook 2-3 minutes until lightly browned but not fully cooked through.
08 - Shape approximately one-quarter of batter into round pancake about 3/4 inch thick in pan, pressing chicken pieces evenly into each pancake.
09 - Cook 4-5 minutes per side, pressing gently with spatula, until golden brown and completely cooked through. Repeat with remaining batter and chicken.
10 - Transfer to plates. Generously drizzle with okonomiyaki sauce and Japanese mayonnaise. Sprinkle with aonori and katsuobushi, adding pickled ginger if desired. Serve immediately.