Lifting the lid off a large ceramic pot with a flourish to reveal his aged shoyu, chef Nobuaki Fushiki tells me that with soy sauce, “taste is born with time.”

As the distinctive aroma of umami wafts into the air at Zenbo Seinei — a Zen wellness retreat designed by Shigeru Ban and located in the north of Awaji Island, Hyogo Prefecture — I’m instructed to place a dash of the rich brown liquid on a small plate.

Most of the 20 members of my group, who hail from North America, Europe and Oceania, are joining a soy sauce tasting for the first time, inspired by their introduction to Japanese cuisine onboard the Silver Nova, one of the newest ships from luxury cruise line Silversea Cruises.