Eel and hatsugatsuo (the season's first bonito) are also included in Engimono, because they are eaten for the purpose of nutritional fortification according to seasons as well as in the hope of obtaining longevity and medical effects.
時節による滋養強壮の目的で長寿や薬事効果を期待して食された物として鰻や初鰹なども縁起物といえる。