Kuappi
RestaurantIisalmi · Since 1907
world's smallest restaurant (Guinness record holder) in Iisalmi, Finland
Food
The best-known place to eat in Finland is Kuappi, Iisalmi. The travel guide lists 37 places to eat and drink in Helsinki and Mariehamn. Local dishes to try: Kalakukko, Egg butter, Mämmi, Runeberg torte, and Semla.
Ordered by how many Wikipedia language editions describe each place. That measures how famous a place is, not how good the food is.
Iisalmi · Since 1907
world's smallest restaurant (Guinness record holder) in Iisalmi, Finland
Helsinki · Since 1887
Espoo
coffeehouse in Espoo, Finland
Since 1920
Finnish bakery company
Turku · Since 1933
bar and building in Turku, Finland
Turku · Since 1998
Listed in the Wikivoyage travel guide. Opening hours and prices change, so check before you go.
Elielinaukio 2
Kaivokatu 1
Vuorikatu 14
Mikonkatu 6
Aleksanterinkatu 46
Töölönlahdenkatu 3B
Jauhokuja 1-3
Ostostie 4
Bulevardi 9
Pohjoisesplanadi 33
Fabianinkatu 37
Mikonkatu 8
Source and corrections: Wikivoyage guide to Helsinki · CC BY-SA 4.0
Ekonomiegatan 2
Torggatan 12
Nygatan
Norragatan 8–10
Torggatan 13
Ångbåtsbron 3
Ångbåtsbryggan 2
Torggatan 4
Strandgatan 12
Nygatan 1
Strandgatan 35
Nygatan 1
Source and corrections: Wikivoyage guide to Mariehamn · CC BY-SA 4.0
Foods and drinks that come from Finland, the most widely known first.

mixture of butter and chopped hard boiled eggs, eaten in Finland and Estonia
Finnish Easter dessert
Finnish pastry flavored with almonds and arrack or rum
traditional Scandinavian sweet roll associated with Shrove Tuesday

traditional Estonian, Finnish and Slavic finely milled flour mixture
Northern Finnish dumplings made with flour and blood
Kuappi, Iisalmi is the most widely documented place to eat in Finland: 7 Wikipedia language editions describe it.
Finland is known for Kalakukko, Egg butter, Mämmi, Runeberg torte, and Semla.
The travel guide to Helsinki lists Vltava, Pronto Central Station, Shoku Burger, Bastard Burgers, and Amarillo.
Sources: Wikidata (CC0), Wikivoyage (CC BY-SA 4.0), photos from Wikimedia Commons.