A bit upscale – and afternoons only, but worth a stop if you’re in the area.
History of Ekiben Lunch Boxes – An Invaluable Part to Any Shinkansen Ride in Japan | tsunagu Japan
https://www.tsunagujapan.com/japan-ekiben/
20 Things in Yokohama – Classics to Hidden Gems – wow-j.com
https://wow-j.com/en/Allguides/kanagawa/sightseeing/02332_en/