Combine flour, baking powder and salt in a bowl and mix with a whisk.
Add a beaten egg.
Pour the cooled dashi broth into the powder in three separate portions and mix well.
The dough is silky because of its high water content. The flour will gradually sink, so mix it lightly with a ladle before using.
To Cook
For an electric grill for takoyaki, set the temperature to 200℃ or heat a takoyaki frying pan over medium heat. Coat the entire surface with vegetable oil of your choice. (If you put in enough oil to make a little pool, it will be like deep frying and will have a crunchy texture.)
When the plate or pan is hot enough, use a ladle to fill the holes with batter.
Add the octopus one by one, and sprinkle the spring onions, red pickled ginger, and tempura bits all over.
Add more batter so that it does not overflow the edge of the takoyaki pan.
Using a skewer, make a line between the holes and separate the dough.
Insert a skewer between the dough and the pan, rotate it along the edge, and turn it over. If the dough is too soft, wait a while.
If the dough protrudes from the hole, use a skewer to place it inside the hole. It is okay if the shape is distorted at this point. The shape will gradually become a beautiful circle. If the heat is too strong, turn it down.
Use a skewer to rotate and shape the takoyaki. If the heat is not evenly applied, switch the location of the takoyaki for even browning.
Place the takoyaki on a plate and cover with takoyaki sauce or okonomiyaki sauce. You can also use a brush to spread the sauce evenly. Top with mayonnaise, dried green seaweed flakes, and bonito flakes, as your choice.