Eternal classic: the sausage / hot dog grill with no name at the beginning of Kirkkokatu. Known as "Fryyseri", "Frysarn", "Korv-Gustafsson", etc. Embedded in the wall of a large old house. The sign above says "Nakkeja pikkulämpimiä, varm korv småvarmt".
Minimalistic decor and the simplest menu you can find. The real speciality is the mustard - supposedly after the real recipe of the kitchen of the Russian Tsar. true or not, it is an exceptional mustard, only available at this joint. Be sure to taste it, and buy a jar or two of it to go.