In a bowl, mix the flour, baking powder, salt, and ground black pepper. Mix well.
Add the egg, soy sauce, pickled red ginger, and cold water. Mix well.
Brush the takoyaki plate with oil. Then fill each hole with the mixture and add 4 pcs of bite-size octopus each whole.
You can cook your takoyaki in the oven. Preheat the oven to 250 degrees F.
Cook the takoyaki mixture for 5 minutes, then carefully flip each takoyaki and cook it for another 5 minutes, or until golden brown.
When all takoyaki are cooked already, put it on a large plate and sprinkle it with cabbage, dried bonito, dried seaweed, and mayonnaise.
Serve and enjoy!