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 evenly combined.
03 - Beat eggs in a separate bowl, then add dashi stock or water and mayonnaise. Mix until smooth and well incorporated.
04 - Pour the wet mixture into the dry ingredients. Stir until just combined—lumps are acceptable and prevent overworking the batter.
05 - Fold shredded cabbage, spring onions, and grated carrot into the batter until evenly distributed throughout.
06 - Heat a large non-stick skillet or griddle over medium heat. Add a small amount of oil to coat the surface.
07 - Add marinated chicken pieces to the 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, pressing chicken pieces evenly into each portion.
09 - Cook for 4-5 minutes per side, pressing gently with a spatula to ensure even cooking. Flip when golden brown and repeat until cooked through. Continue with remaining batter and chicken.
10 - Transfer pancakes to plates. Generously drizzle with okonomiyaki sauce and Japanese mayonnaise. Sprinkle with aonori, katsuobushi, and pickled ginger if desired. Serve immediately while hot.