the sword 's sweat ( bodily juices ) makes the onigiri taste more better .
also , from some henta* , i learn that "mayonnaise" makes ramen taste more better , lol .
this manga is NSFW : https://mangadex.org/title/28249/yadokari-fuck-iede-dc-furousha-ochinpo-josou-pakopako-mesubuta-acme