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 crepe batter.
02 - Heat the takoyaki pan over medium heat and lightly oil each half-sphere compartment using a brush or paper towel.
03 - Pour the batter into the pan, filling each mold completely to the top. Work quickly to ensure even cooking across all compartments.
04 - Place one piece of octopus into each hole, then evenly distribute the pickled red ginger, green onion, and tempura scraps among all the molds.
05 - Cook for 1-2 minutes until the edges begin to set and turn golden brown.
06 - Insert skewers or chopsticks into the edge of each takoyaki and turn 90 degrees. This allows uncooked batter to spill out and form the spherical shape. Continue turning every minute until all sides are evenly golden and crispy, approximately 8-10 minutes total.
07 - Remove the takoyaki balls from the pan and arrange on a serving plate. Drizzle generously with takoyaki sauce and Japanese mayonnaise in a zigzag pattern, then sprinkle with aonori and bonito flakes. Serve immediately while hot and crispy.