01 - Whisk together flour, eggs, dashi stock, salt, soy sauce, and baking powder in a mixing bowl until completely smooth. The batter should have a thin, pourable consistency similar to heavy cream.
02 - Preheat the takoyaki pan over medium heat and lightly brush each compartment with oil to prevent sticking.
03 - Pour batter into the pan, filling each half-sphere mold completely to the brim.
04 - Place one piece of octopus into each filled hole, then evenly distribute red ginger, green onion, and tempura scraps across all molds.
05 - Cook for 1-2 minutes until the edges begin to set and turn golden brown.
06 - Use cooking chopsticks or skewers to turn each ball 90 degrees, allowing uncooked batter to spill out and form the round shape. Continue turning every minute until evenly golden and crisp on all sides, approximately 8-10 minutes total cooking time.
07 - Transfer finished takoyaki balls to a serving plate using chopsticks or tongs.
08 - Drizzle generously with takoyaki sauce and Japanese mayonnaise in a zigzag pattern. Sprinkle with dried seaweed flakes and bonito flakes. Serve immediately while hot and crispy.