Volumes 31 and 32 of "Konjaku Monogatari Shu " (Tales of Times Now Past) referred to ayuzushi (fermented sushi with sweetfish) 'sold in town,' which is the oldest record that there existed a sushi restaurant in Kyoto, whose form was unknown, during the late Heian period when "Konjaku Monogatari Shu" was finished.
『今昔物語集』巻第31第32に「市町に賣る」鮨鮎と言及されており、これが『今昔物語集』が成立した平安時代末期に、形態は不明ではあるが京都に寿司屋が存在したとみられる最古の記録である。