Hernekeitto: Finland's Thursday Food Tradition

Walk into almost any Finnish workplace canteen, school cafeteria, or neighborhood lunch buffet on a Thursday, and you will smell something unmistakable: simmering peas, savory smoked pork, and sweet baked pastry. Welcome to one of Finland's most enduring dining rituals: hernekeitto (pea soup) followed by pannukakku (thick oven pancake).

For international visitors, seeing an entire country eat the exact same meal every Thursday might seem surprising. Yet in Finland, this weekly lunch is a comforting national institution that spans centuries of Nordic history.

Why do Finns eat pea soup on Thursdays?

The usual explanation goes back to the Middle Ages, when Finland was part of the Swedish realm. In Catholic times, Friday was a strict day of fasting. People needed a hearty, calorie-dense meal on Thursday to sustain themselves through the following day. Dried peas and salted pork were cheap, nutritious, and lasted through the long, freezing winter months.

Even after the Protestant Reformation ended mandatory fasting, the culinary habit stuck. Finns loved the tradition too much to abandon it. Generations grew up associating Thursday with a warm, filling bowl.

Today, whether you eat at a school cafeteria, an office lounasravintola (lunch restaurant), or in the Finnish military, the unwritten rule remains unbroken: torstai on hernekeittopäivä ("Thursday is pea soup day").

How to eat hernekeitto like a local

Finnish pea soup is thick and slow-cooked. It is usually made from kuivatut herneet (dried green peas), water, onions, and diced ham or smoked pork. If you do not eat pork, do not worry: modern lunch spots almost always offer a kasvishernekeitto (vegetarian pea soup) made with vegetable stock and plant protein.

When you serve yourself at a Finnish lunch buffet, you will notice a row of toppings sitting right beside the big soup pot. Two toppings usually wait beside the pot:

1. Sinappi (mustard): A dollop of sweet and spicy Finnish mustard stirred directly into the broth gives the soup its iconic kick.
2. Sipuli (onion): Some people sprinkle finely chopped raw onion on top for crunch.

And never skip the dessert table! In Finnish dining tradition, pea soup is incomplete without pannukakku (oven pancake). Unlike thin crêpes, Finnish pancake batter is poured onto a deep baking tray and baked until golden and puffy. You slice it into squares and top it generously with mansikkahillo (strawberry jam) and sometimes whipped cream.

Dishes like these also show how Finnish builds vocabulary. As we cover in our guide to Finnish compound nouns, words like hernekeitto (herne "pea" + keitto "soup") and pannukakku (pannu "pan" + kakku "cake") explain themselves once you spot their pieces!

Language corner

Here are useful phrases you can use when ordering lunch on a Thursday:

• Torstaina syödään hernekeittoa. ("On Thursday, pea soup is eaten.")
• Otanko sinappia keittoon? ("Shall I take mustard in the soup?")
• Onko tämä kasvishernekeitto? ("Is this the vegetarian pea soup?")
• Pidän tulisesta sinapista. ("I like spicy mustard.") — test your food preferences with our lesson on expressing likes and dislikes in Finnish.
• Jälkiruoaksi on pannukakkua ja mansikkahilloa. ("For dessert there is oven pancake and strawberry jam.")

Key vocabulary for your next cafeteria visit:

Did you know?

In the Finnish Defence Forces (Puolustusvoimat), conscripts have eaten hot pea soup and oven pancakes every single Thursday for decades. It is one of the military's best-known traditions.

Practise this with Kielo

Next time you open Kielo, try using these dining words in a chat conversation about lunch plans. You can add terms like hernekeitto and sinappi to your daily review deck to cement them in memory. Enjoy your meal: Hyvää ruokahalua!