You will be able to find these along the streets. Most can be found as cafe-style eateries along the sidewalls. You can have all kinds of food including exotic ones like smoked fish.
This Finland food is called Kanaviillokki or chicken sauce. It bears so much resemblance to Greek or Mediterranean recipe.
If you are new to Finland food, I will suggest you find your way round their cuisine with the borsch soup which is called Borschkeitto.
In Finland food, it is called rieska but this rye bread is made in flat style. You will need a cup of oatmeal and 2 cups of buttermilk.