- Place flour in a medium-sized mixing bowl and slowly mix in the dashi. Break egg in a separate bowl, add salt and soy sauce and then beat with a fork. Add egg mixture to the flour mixture. Cut up octopus into approximately ½" cubes.
- Place takoyaki pan over high heat, and when hot brush the holes with vegetable oil. Place one piece of octopus in each hole, then fill each hole with batter. Add green onions and Tenkasu in that order. When after a few minutes the takoyaki start to set, turn each one 180 degrees. Continue to cook until crisp, turning each one another couple of times, so that they get golden brown all over. Spoon a little Katsu sauce on them if desired and garnish with katsuobushi flakes.
- Eat immediately, but, be warned, they are molten hot!