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Preserve

Preservation of Yeast

A method to test yeast viability using water, whisky, sugar, and flour.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Corn and wheat match in chemistry and in kitchens. They rank in the top 5% of all ingredient pairs, and cooks put them together in 465 recipes. Both carry hexanal, which smells green, grassy. The science ↓

Preservation of Yeast

Ingredients

Directions

Test the yeast

  1. Pour a few drops of yeast into boiling water.

  2. Observe: if the yeast sinks, it is spoiled; if it floats, it is good.

Make the mixture

  1. In a bowl, combine 1 pound of yeast, 3 tablespoons of corn whisky or brandy, a pinch of sugar, and 2 tablespoons of wheat flour.

  2. Mix thoroughly and let the mixture stand in a warm place.

  3. If the yeast is good, it will rise in about an hour.

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. Corn + wheattop 5% of all pairs
    Smell alikestrong
    Cooked together465 recipes

    Shared aroma: hexanal (green, grassy).

  2. Wheat + flourtop 12% of all pairs
    Smell alikemoderate
    Cooked together4,373 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  3. Corn + flourtop 13% of all pairs
    Smell alikemoderate
    Cooked together6,165 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Sugar + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

  5. Corn + sugartop 21% of all pairs
    Smell alikelow
    Cooked together7,168 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

Yeast
Its living cells produce gas that makes the mixture rise, which is what the test checks.
Wheat flour
Supplies starch that yeast can work on, giving the mixture body to show rising.
Sugar
Gives the yeast a quick food source to start fermenting.

The step that matters

Judging the boiling water test. Yeast that is too weak or dead will not float reliably, so a sinking sample signals spoilage. Use only a few drops so the test reads clearly.

“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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