Name: To Roast Ducks
Ingredients: 2 young ducks; 2 parboiled onions; 2 teaspoons minced sage; ¼ teaspoon pepper; 1 slice of butter; coarse sea salt; good brown gravy

Why it works: Sage and pepper match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 5,388 recipes. Both carry beta-phellandrene, which smells minty, terpene. The science ↓

To Roast Ducks

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 the ducks

Remove the feathers, heads, and necks from the ducks, leaving the feet on.
Hold the ducks in boiling water for a few minutes to loosen the skin, then peel it off.
Wash the insides of the ducks with water and wipe the outsides with a dry cloth.
Cut the wings at the first joint and trim the feet behind the backs.

Stuff and roast

Stuff the ducks with a mixture of parboiled onions, minced sage, pepper, and butter.
Roast the ducks at 400°F (200°C), basting constantly.
When the breasts are plump and steam rises towards the fire, serve quickly with brown gravy.

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.

Sage + peppertop 3% of all pairs

Smell alikestrong

Cooked together5,388 recipes

Shared aroma: beta-phellandrene (minty, terpene).
Onion + peppertop 11% of all pairs

Smell alikemoderate

Cooked together68,474 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Onion + sagetop 12% of all pairs

Smell alikemoderate

Cooked together3,628 recipes

Shared aroma: coumarin (sweet, hay).
Onion + buttertop 15% of all pairs

Smell alikemoderate

Cooked together42,912 recipes

Shared aroma: decanal (soap, orange peel).
Sage + buttertop 17% of all pairs

Smell alikemoderate

Cooked together3,312 recipes

Shared aroma: 3-hexenal (apple, fruity).

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

What each ingredient does

Ducks: Provide the main meat, with rich fat that renders during roasting.
Butter: Adds fat and moisture inside the bird and helps browning on the skin.
Onions: Perfume the stuffing and add moisture and gentle sweetness as they soften.
Sage: Adds a savoury, aromatic herbal flavour that suits rich duck meat.

The step that matters

Roast at 400°F (200°C), basting constantly. Duck skin has a thick fat layer that must render and crisp while the meat stays juicy. Frequent basting moistens the surface and helps the skin brown evenly without drying the breast, so the timing and heat need close attention.