The kanji for "bird" is an umbrella term for birds of prey in ancient Chinese. In ancient times, the "birds" that the Japanese could roast and eat were mainly quails, pigeons, ducks, geese, chickens, and other birds, and then the Japanese used "yakitori" to refer to roasted chickens, so it is difficult to buy roasted goose meat at yakitori restaurants in Japan.
Nowadays, of course, yakitori restaurants don't just serve chicken, but more accurately, all charcoal-grilled ingredients. The Japanese don't care if you grill onions, garlic, shiitake mushrooms, okra, prawns, takoyaki, squid rolls, or okonomiyaki, as long as you ask for it to be grilled over charcoal, you can call it yakitori. That's why, whereas in China such dishes are mostly served in street stalls, in Japan they are often spacious, crowded and bustling.
At the store, you can savor skewered and grilled two large shiitake mushrooms, skewered four green peppers, skewered a few eggs or dried tofu, or even skewered vegetables wrapped in meat, meat wrapped in vegetables, and mixed skewers with vegetables and meat, the list goes on and on.
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