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Pistachio Kernels, Burnt

A sweet, caramelized pistachio snack coated in multiple layers of sugar syrup.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Pistachio and spinach match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 110 recipes. Both carry nonanal, which smells fat, citrus. The science ↓

Pistachio Kernels, Burnt

Oven, in the book's wordsA gentle oven

Ingredients

Directions

The book says “a gentle oven”. The 300°F (150°C) in the steps is the modern equivalent, not the book's own figure.

Prepare the kernels

  1. Blanch and peel the pistachio kernels.

  2. Place them in a 300°F (150°C) oven until dry and hot.

Make the sugar coating

  1. In a saucepan, combine the sugar with enough water to dissolve it.

  2. Add vanilla flavoring and spinach juice.

  3. Boil until nearly brittle.

  4. Remove from heat.

  5. Add the pistachios.

  6. Stir until well coated.

  7. Transfer to a sieve.

  8. Let sit for a few minutes to cool.

  9. Pick off excess sugar.

Build the coating

  1. Return it to the pan with water.

  2. Boil again.

  3. Repeat the coating process two more times until the kernels double in size.

  4. Optionally, add more spinach coloring during the last boil.

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. Pistachio + spinachtop 1% of all pairs
    Smell alikestrong
    Cooked together110 recipes

    Shared aroma: nonanal (fat, citrus).

  2. Pistachio + vanillatop 8% of all pairs
    Smell alikestrong
    Cooked together407 recipes

    Shared aroma: alpha-pinene (pine, turpentine).

  3. Sugar + vanillatop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

    Shared aroma: beta-damascenone (apple, rose).

  4. Vanilla + spinachtop 16% of all pairs
    Smell alikestrong
    Cooked together83 recipes

    Shared aroma: 1-octen-3-ol (mushroom, earthy).

  5. Pistachio + sugartop 21% of all pairs
    Smell alikemoderate
    Cooked together1,233 recipes

    Shared aroma: 1-penten-3-one (fish, pungent).

Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 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

Pistachio kernels
The main ingredient, which the sugar coating is built around and which gives the nut its flavor.
Loaf sugar
Forms the crisp, brittle coating that hardens around each kernel as the syrup cools.

The step that matters

Boiling the sugar to nearly brittle. If the syrup is under-boiled, the coating stays tacky and will not harden; if over-boiled, it turns bitter or sets too hard to coat evenly. Stopping at nearly brittle gives a coating that is crisp yet still adheres to the kernels.

Swap the spinach

The recipe marks spinach as optional. How well each one fits the dish's main ingredients (pistachio, sugar, vanilla):

  1. Arrowrootfits better
  2. Beetrootfits better
  3. Sweet potatofits better
  4. Spinachthe original

Fit is the average pairing score against pistachio, sugar, vanilla. 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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