Buy a shūmai bentō, eat it cold on the platform, and keep the gourd
Built to be eaten cold on a train
Kiyoken, founded at Yokohama Station in 1908, launched its Shūmai Bentō in 1954 and popularised shūmai across Japan. In the box is Hyōchan, a gourd-shaped porcelain soy-sauce bottle drawn in 1955 by the manga artist Yokoyama Ryūichi, originally in 48 faces, one per hiragana character.
Why it's unique
This is the origin of a national icon of Japanese train food, and it is engineered for one setting. The rice is steamed to stay chewy when cold, and the box is kyōgi, thin shaved wood that breathes and draws moisture out. Residents eat it on the platform or in the train seat, and that is the ritual. Eating it in a restaurant misses the point.
The free factory tour is the other half: about 90 minutes watching the shūmai and bentō lines, the Hyōchan display and a history of train lunches, with a tasting straight off the line.
Before you go
Keep the Hyōchan. Yokohama households have drawers of them, and a 2025 anniversary run went to 98 designs across seven colours, with a rare gold one.
The factory tour runs Tuesday, Wednesday, Friday and Saturday in four slots. Reservation is required online, opens three months ahead, and goes fast, so book the moment your dates are fixed.