Name: Irish Mushroom Soup
Ingredients: 1 lb mushrooms, quartered; 4 scallions, thinly sliced; 1 cup fresh parsley, finely chopped; 4 tablespoons butter; 2 cups heavy cream; 1 cup flour; salt to taste; 8 cups chicken stock; 6 teaspoons ground pepper; 1/2 medium onion, finely chopped

Why it works: Parsley and pepper match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and cooks put them together in 34,122 recipes. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓

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.

Parsley + peppertop 2% of all pairs

Smell alikestrong

Cooked together34,122 recipes

Shared aroma: 4'-methylacetophenone (bitter almond).
Mushroom + chickentop 4% of all pairs

Smell alikemoderate

Cooked together4,172 recipes

Shared aroma: 1-butyl acetate (fruity, banana).
Mushroom + buttertop 7% of all pairs

Smell alikemoderate

Cooked together12,525 recipes

Shared aroma: trans-2-decenal (waxy, orange).
Butter + creamtop 8% of all pairs

Smell alikemoderate

Cooked together41,516 recipes

Shared aroma: delta-dodecalactone (sweet, creamy).
Chicken + oniontop 8% of all pairs

Smell alikemoderate

Cooked together17,814 recipes

Shared aroma: gamma-nonanolactone (coconut, sweet).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Mushrooms: Provide the main body and earthy flavor of the soup as they release moisture and brown.
Butter: Carries flavor and enriches the soup while softening the vegetables without browning them quickly.
Flour: Thickens the soup by absorbing liquid and forming a smoother, more body-filled base.
Heavy cream: Adds richness and a silky texture through its fat content.
Chicken stock: Forms the liquid base of the soup and carries the other flavors.
Onion: Adds savory sweetness as it cooks down and turns golden.

The step that matters

Stirring in the flour. Flour clumps if added to hot liquid without being stirred in well. Stirring thoroughly and adding it gradually, while keeping the soup moving, helps it dissolve evenly and thicken smoothly.

Swap the parsley

How well each one fits the dish's main ingredients (mushroom, butter, cream, flour, chicken, pepper, onion):

Garlicfits better
Thymefits better
Parsleythe original
Celeryfits about as well

Fit is the average pairing score against mushroom, butter, cream, flour, chicken, pepper, onion. 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.

Ingredient	Portion assumed	kcal
Flour	1 cup (125g) all-purpose	455
Chicken	100g cooked	165
Butter	1 tbsp (14g)	102
Cream	1 tbsp (15ml) heavy	51
Onion	1 medium (110g)	44
Mushroom	1/2 cup sliced (35g)	15
Pepper	1 tsp ground (2.3g)	6
Parsley	1 tbsp chopped fresh (3.8g)	1
Salt	1 tsp (6g)	0

Irish Mushroom Soup