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 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 top.
04 - Place one piece of octopus into each filled hole, then evenly distribute red ginger, green onion, and tempura scraps across all the 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 flow out and form the spherical shape. Continue turning every minute until evenly golden and crispy on all sides, approximately 8-10 minutes total.
07 - Remove finished takoyaki from the pan and arrange on a serving plate. Drizzle with takoyaki sauce and mayonnaise, then sprinkle with dried seaweed flakes and bonito flakes. Serve immediately while hot and crispy.