01 - In a mixing bowl, whisk together flour, eggs, dashi stock, salt, soy sauce, and baking powder until smooth. The batter should be thin and pourable.
02 - Preheat a takoyaki pan over medium heat and lightly oil each compartment.
03 - Pour the batter into the pan, filling each hole to the top.
04 - Add a piece of octopus to each hole, then sprinkle with red ginger, green onion, and tempura scraps.
05 - Cook for 1-2 minutes until the edges start to set. Use skewers or chopsticks to turn each ball 90 degrees, allowing uncooked batter to flow out and form a round shape.
06 - Continue turning the balls every minute or so until they are evenly golden and crisp on all sides (about 8-10 minutes total).
07 - Remove takoyaki from the pan and arrange on a plate.
08 - Drizzle with takoyaki sauce and mayonnaise, then sprinkle with aonori and bonito flakes. Serve hot.