Tako means octopus in Japanese, and takoyaki are known as octopus balls.
Mix flour, dashi soup, and eggs in a bowl to make batter. Thickness of the batter should be like potage (thick) soup.
Put oil inside cups of a takoyaki grill pan. Pour batter into the cups to full.
Put octopus, red ginger, and green onion in center of each hole.
Grill takoyaki balls, turning with a pick.
When takoyaki become round and brown, remove them from the pan and place in a plate. Put sauce and mayonnaise on takoyaki and sprinkle bonito flakes and aonori on top.