Takoyaki is a ball-shaped Japanese snack made of a wheat flour-based batter and cooked in a special takoyaki pan. It is typically filled with minced or diced octopus, tempura scraps (tenkasu), pickled ginger, and green onion. Takoyaki are brushed with takoyaki sauce, a sauce similar to Worcestershire sauce, and mayonnaise. The takoyaki is then sprinkled with green laver (aonori) and shavings of dried bonito (katsuobushi). Takoyaki is very popular in Osaka, especially if there is a festival or a particular event in the summer.