Name: Sole Au Gratin
Ingredients: 1 sole; 4 button mushrooms, chopped; 2 teaspoons chopped parsley; 1 teaspoon chopped onion; 1 teaspoon lemon juice; ¼ cup browned breadcrumbs; 2 tablespoons butter; Pepper to taste; Coarse sea salt to taste

Why it works: Parsley and lemon match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 14,037 recipes. Both carry beta-phellandrene, which smells minty, terpene. The science ↓

Sole Au Gratin

Ingredients

Directions

The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.

Prepare

Skin and fillet the sole.
Place the fillets on a plate with the skin side up.
Top the fillets with chopped mushrooms, parsley, onion, lemon juice, pepper, and salt.
Fold each fillet in half.

Bake and serve

Sprinkle browned breadcrumbs over each fillet.
Add small pieces of butter on top.
Bake on a buttered baking sheet at 400°F (200°C) for about 8 minutes.
Serve on a hot dish with tomato or white sauce around it.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

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 + lemontop 1% of all pairs

Smell alikestrong

Cooked together14,037 recipes

Shared aroma: beta-phellandrene (minty, terpene).
Parsley + peppertop 2% of all pairs

Smell alikestrong

Cooked together34,122 recipes

Shared aroma: 4'-methylacetophenone (bitter almond).
Lemon + peppertop 3% of all pairs

Smell alikestrong

Cooked together27,047 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Mushroom + buttertop 7% of all pairs

Smell alikemoderate

Cooked together12,525 recipes

Shared aroma: trans-2-decenal (waxy, orange).
Parsley + oniontop 9% of all pairs

Smell alikemoderate

Cooked together25,843 recipes

Shared aroma: 2,4-decadienal (seaweed).

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

What each ingredient does

Sole: Forms the main protein; its delicate flesh cooks quickly and becomes flaky when baked.
Button mushrooms: Add moisture and savory earthy flavour that keeps the fish from drying out.
Browned breadcrumbs: Form a crisp, golden topping through browning and add a toasted texture.
Butter: Adds fat that carries flavour and promotes browning on the topping.
Lemon juice: Adds acidity that brightens the fish and balances the richness of the butter.

The step that matters

Bake on a buttered baking sheet at 400°F (200°C) for about 8 minutes. Fish flesh cooks quickly and turns dry and rubbery if overbaked, so the short time matters. Butter on the sheet prevents sticking, and the butter on top helps the breadcrumbs brown evenly.

Swap the onion

How well each one fits the dish's main ingredients (mushroom, parsley, lemon, butter, pepper):

Shallotfits better
Carrotfits better
Spinachfits better
Onionthe original

Fit is the average pairing score against mushroom, parsley, lemon, butter, pepper. 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.