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Rack of Lamb Boulangere

Rack of lamb roasted with onions, potatoes, butter, and water.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Onion and potato are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Rack of Lamb Boulangere

Ingredients

Directions

The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.

Prepare

  1. Preheat your oven to 350°F (175°C).

  2. Season the rack of lamb with salt and pepper.

  3. In a large bowl, combine the sliced onions, cubed potatoes, butter, and water.

Cook

  1. Place the lamb and vegetable mixture into a cooking bag.

  2. Cook in the oven for 45 minutes.

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.

  1. Onion + potatotop 3% of all pairs
    Smell alikemoderate
    Cooked together9,023 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  2. Pepper + potatotop 9% of all pairs
    Smell alikemoderate
    Cooked together8,305 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  3. Lamb + potatotop 9% of all pairs
    Smell alikemoderate
    Cooked together520 recipes

    Shared aroma: 2-undecenal (sweet).

  4. Pepper + oniontop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  5. Lamb + peppertop 12% of all pairs
    Smell alikemoderate
    Cooked together3,165 recipes

    Shared aroma: 2-nonenal (fatty, green).

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

What each ingredient does

Rack of spring lamb
Provides the main meat, which is cooked gently in the bag to stay tender and juicy.
Potatoes
Absorb juices from the lamb and become soft and starchy as they cook.
Onions
Soften and turn sweet as they cook in the trapped moisture and fat.
Butter
Adds fat that carries flavour and helps the vegetables brown lightly.

Swap the onion

How well each one fits the dish's main ingredients (lamb, pepper, potato, butter):

  1. Asparagusfits better
  2. Capsicumfits about as well
  3. Spinachfits about as well
  4. Onionthe original

Fit is the average pairing score against lamb, pepper, potato, butter. 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.

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