The president of Suehiro at the time introduced sukiyaki for the reason that "it was not possible to sell yakiniku (grilled meat) during summertime," and shabu-shabu, which is often considered to be a winter dish, is actually a typical summer dish.
スエヒロの当時の社長が、しゃぶしゃぶを始めたきっかけは『夏場に焼肉が売れないため』の対策であり、冬の料理と思われがちなしゃぶしゃぶだが、実際は夏の料理であり、俳句の季語として使うのであれば、『夏』が正しい。