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 - In a large bowl, whisk together flour, baking powder, and salt until thoroughly combined.
03 - Beat eggs in a separate bowl, then add dashi stock (or water) and mayonnaise. Whisk until smooth and well incorporated.
04 - Pour wet mixture into dry ingredients. Stir gently until just combined—do not overmix. Small lumps are acceptable and will result in a tender texture.
05 - Add shredded cabbage, spring onions, and grated carrot to the batter. Fold until vegetables are evenly distributed throughout the mixture.
06 - Heat a large non-stick skillet or griddle over medium heat. Lightly oil the surface to prevent sticking.
07 - Add marinated chicken pieces to the hot pan. Cook for 2-3 minutes until lightly browned but not fully cooked through.
08 - Shape approximately one-quarter of the batter into a round pancake about 3/4 inch thick in the pan. Press chicken pieces evenly into the batter.
09 - Cook for 4-5 minutes per side, pressing gently with a spatula to flatten. Flip when golden brown and continue until cooked through completely. Repeat with remaining batter and chicken.
10 - Transfer cooked pancakes to serving plates. Drizzle generously with okonomiyaki sauce and Japanese mayonnaise. Sprinkle with aonori, katsuobushi, and pickled ginger if desired. Serve immediately while hot.