Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Slovak Christmas Soup
Ingredients
Directions
Prepare the soup base
Wash mushrooms well and cut them small.
Cook the mushrooms in 2 quarts of water for half an hour.
Add sauerkraut and cook for another 15 minutes.
Make the roux
In a saucepan, melt 2 tablespoons shortening.
Add flour to the shortening and brown lightly.
Stir constantly while pouring in milk and cooking until smooth.
Add the roux to the mushrooms and sauerkraut.
Finish and serve
Fry the onions in the tablespoon of butter until lightly browned.
Pour the onions into the soup.
Cook the soup together for a minute and season with salt to taste.
Sprinkle paprika over the soup.
Nutrition, whole recipe (rough)
Counts 5 of 6 ingredients. The other 1 aren't in our nutrition table and add nothing above, so the real totals are higher.
What these numbers assume: 5 portions
| Ingredient | Portion assumed | kcal |
|---|---|---|
| Flour | 1 cup (125g) all-purpose | 455 |
| Milk | 1 cup (244ml) whole | 149 |
| Butter | 1 tbsp (14g) | 102 |
| Onion | 1 medium (110g) | 44 |
| Mushroom | 1/2 cup sliced (35g) | 15 |
| Sauerkraut | not in our table | 0 |
One typical portion per ingredient; the recipe's quantities are not counted. A rough guide only, not for medical or dietary planning.
Steps grouped into stages for easier reading; the method is the source's own.
Explore the science
The flavor team
The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.
-
Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Mushroom + buttertop 7% of all pairsSmell alikemoderateCooked together12,525 recipes
Shared aroma: trans-2-decenal (waxy, orange).
-
Mushroom + oniontop 10% of all pairsSmell alikemoderateCooked together10,626 recipes
Shared aroma: 2,4-decadienal (seaweed).
-
Mushroom + milktop 12% of all pairsSmell alikemoderateCooked together2,231 recipes
Shared aroma: 1-hexanal (fruit).
-
Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour barely smell alike, yet cooks put them together in 124,287 recipes: they work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Mushrooms
- Give the soup its main body and earthy flavor as they cook down in water.
- Sauerkraut
- Adds sourness and tang that balances the rich milk and roux.
- Flour
- Browned in fat and cooked with milk, it thickens the soup into a smooth body.
- Milk
- Makes the roux into a creamy, smooth liquid that enriches the soup.
- Shortening
- Carries the flour for the roux, helping it brown and coat evenly.
- Onions
- Frying them until lightly browned adds sweetness and savory depth.
The step that matters
Cooking the roux until smooth. Stirring constantly while adding milk keeps flour lumps from forming, since flour clumps when hot liquid hits it unevenly. Lightly browning the flour first also gives the soup a nutty flavor.
Swap the onion
How well each one fits the dish's main ingredients (mushroom, butter, flour, milk):
- Shallotfits better
- Potatofits better
- Chivefits better
- Onionthe original
Fit is the average pairing score against mushroom, butter, flour, milk. Candidates are from the same food group and used in at least 100 recipes.
“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.
You might also like
Mushroom Soup60 recipes
Tomato Soup526 recipes
Brown Bread461 recipes
Mutton Broth292 recipesThe free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.