Osaka area The origin of kushiage is said to be served at food bars in downtown Osaka, in the
Shinsekai neighborhood. Kushikatsu restaurants specialize in the dish. As that menu spread to other areas of Osaka and beyond, it is standard that kushikatsu are prepared with a single food—not like that in Tokyo where, for example, they alternately put pork and onion on a skewer. Wider varieties of foods were prepared as the menu developed, unlike those in Nagoya or Tokyo—for instance, thin slices of pickled ginger or sausage by itself. Generally speaking, the food on a skewer is smaller in Osaka-style kushikatsu, and customers tend to order larger numbers of kushi compared to Tokyo or Nagoya. That encouraged many kushiage restaurants to use a premixed "batter flour" of powdered egg and flour (compared to that in Tokyo or Nagoya where batter is prepared with fresh egg, water and flour topped with panko crusts). High-end kushiage restaurants in Osaka serve kushikatsu in Tokyo-Nagoya style. Grated
yam is added for softer texture. New types of kushikatsu restaurants serve fondue-style kushikatsu, in which customers fry kushi at the table in a deep pan with cooking oil. Kushinobō is a typical high-end Osaka-style kushiage restaurant with franchises across Japan, and it is appreciated for its unique serving style — until a customer informs staff that they are full and do not need any more, staff continues to bring variations of kushiage to the table.
Tokyo area The basic kushikatsu in
Kanto eastern Japan area including
Tokyo is made with diced pork rib in 3–4 cm (1.5 in) cubes, skewered with sliced onions or leeks. Battered with fresh egg, flour and a thin layer of
panko crust, the skewer is deep-fried in vegetable oil —
cottonseed, soybean, canola or rapeseed oil. At the table, skewers are seasoned with thick brown sauce, sweeter than Worcestershire sauce, with mustard if provided in the cruet stand.
Nagoya area sauce, originated in the Nagoya region. In
Nagoya and its surrounding cities, they serve the local specialty
doteni, and have an option to order kushikatsu with it. Unlike the serving style in Osaka and Tokyo, in Nagoya they dip kushikatsu in the thick sauce they grilled and sauteed beef sinew. That sauce is based on hatcho-miso, and the kushikatsu is called miso katsu. == Other varieties ==