Inside Hakodate Morning Market, Kikuyo Shokudo got its start in the 1950s as a counter joint to feed market workers and is now one of the top reasons to come to Hakodate. The speciality here is the Hakodate tomoe-don (函館巴丼; ¥1780), rice topped with raw uni (sea urchin), ikura (salmon roe) and hotate (scallops). There's a picture menu.
You can also custom-make kaisen-don (raw seafood over rice) from the list of toppings or sample another Hakodate speciality: ika-sōmen (raw squid sliced very thinly like noodles; ¥1150).