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Fruit Yeast

Fruit yeast is a fermented yeast made from raisins and potatoes, used as a leavening agent.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Raisin and sugar are a kitchen classic. They rank in the top 13% of all ingredient pairs, and cooks put them together in 12,481 recipes. Both carry beta-damascenone, which smells apple, rose. The science ↓

Fruit Yeast

Ingredients

Directions

Prepare the raisin culture

  1. Wash the raisins well and soak them in warm water for 2-3 days until fermentation occurs, indicated by bubbles on the surface.

Make the potato mixture

  1. Boil the potatoes until tender, then mash them finely or sift through a colander.

  2. Add salt and sugar to the mashed potatoes.

  3. Cool the mixture to blood temperature, then add enough raisin water to achieve the right consistency, about 2 cups.

Rise and store

  1. Let the mixture rise until light, then transfer to clean glass jars and store in a cool place.

  2. For best results, use the yeast a few days after preparation.

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. Raisin + sugartop 13% of all pairs
    Smell alikemoderate
    Cooked together12,481 recipes

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

  2. Raisin + potatotop 16% of all pairs
    Smell alikemoderate
    Cooked together91 recipes

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

  3. Potato + sugartop 30% of all pairs
    Smell alikelow
    Cooked together3,032 recipes

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

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

What each ingredient does

Raisins
Ferment in warm water, releasing the yeast activity that leavens the mixture.
Potatoes
Provide starch and body that give the yeast mixture its thick, workable consistency.
Sugar
Feeds the yeast, supporting fermentation and the rise.

The step that matters

Cool the mixture to blood temperature before adding raisin water. Yeast is killed by high heat, so the potato mixture must be cooled to a mild, blood-warm temperature before the raisin water is added. Adding it while hot can stop fermentation before the rise begins.

Swap the potato

How well each one fits the dish's main ingredients (raisin, sugar):

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

Fit is the average pairing score against raisin, sugar. 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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