The ekiben stand inside the ticket gate sells healthy & veg-friendly bento. Try the brown riceinari set. No English, but the bento are displayed, so you can point to what you want.
4lines go thru here.2 r express(Shinkansen).Tohoku Main got us2 Tokyo Ueno Stn @a fraction of cost of Shinkansen's ticket.Needless 2say it took longer time since it's an all-stop svc.