What Is Kapuśniak?

Kapuśniak is a traditional Polish soup made with sauerkraut, vegetables, spices, and usually some kind of smoked meat. Every family makes it a little differently.

Some versions are very sour. Some are mild. Some are brothy, others thick and hearty. This one sits right in the middle: comforting, balanced, and deeply satisfying.

This version is how I make it at home. Simple ingredients, bold flavor, and a traditional roux at the end to give it that silky, slightly thick finish Polish soups are famous for.

Why You’ll Love This Soup

Cozy, filling, and perfect for cold days
Made with simple pantry ingredients
Naturally comforting and nourishing
Even better after it rests overnight
Tastes like something your grandma would approve of

Ingredients

For the Soup

1 ring smoked kielbasa, sliced or diced
1 bag sauerkraut, drained (reserve the juice)
1 large onion, diced
1 large carrot, grated
5–6 potatoes, peeled and diced
1 tablespoon chicken-flavored bouillon
3 bay leaves
5 allspice berries
3 tablespoons Italian seasoning
Salt and black pepper, to taste

For the Roux (Traditional Thickening)

2 tablespoons oil
2 tablespoons all-purpose flour

How to Make Kapuśniak

Start by draining the sauerkraut and saving the juice. You may want it later to adjust the sourness.

In a large pot, sauté the diced onion and kielbasa over medium heat until lightly browned. This step builds flavor, so let everything take its time.

Add the grated carrot and cook for another 2 to 3 minutes, just until fragrant.

Next, stir in the sauerkraut, potatoes, bay leaves, allspice berries, Italian seasoning, and bouillon. Add enough water to cover everything.

Bring the soup to a gentle boil, then reduce the heat and let it simmer for about 30 minutes, until the potatoes are tender and the flavors come together.

In a small pan, make the roux by heating the oil and whisking in the flour. Cook until lightly golden, stirring constantly.

Slowly add a ladle of hot soup into the roux, whisking to smooth it out, then pour the mixture back into the pot. Stir well.

Taste the soup. Adjust with salt, pepper, or a splash of reserved sauerkraut juice if you want more tang.

Let it simmer for a few more minutes, then turn off the heat and serve.

Important Notes & Tips

Save the sauerkraut juice. Every brand has a different level of sourness. Adding a little back at the end lets you control the flavor.
Don’t rush it. Kapuśniak likes a gentle simmer, not a hard boil.
Better the next day. Like many Polish soups, the flavor deepens overnight.
Too sour? Add a pinch of sugar or an extra potato next time to balance it.

How to Serve Kapuśniak

This soup is perfect on its own, but it loves company:

With a slice of crusty bread or rye
With buttered toast
With a spoonful of sour cream on top
The next day, reheated slowly (arguably the best version)