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