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Yeast

A liquid yeast mixture made by boiling hops and potatoes, then adding flour, salt, sugar, and yeast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Flour and sugar are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 92,116 recipes. Both carry phenylacetaldehyde, which smells hawthorne, honey. The science ↓

Yeast

Ingredients

Directions

Make the liquids

  1. Boil hops and potatoes in separate pans.

  2. Strain both liquids while hot into a large bowl.

Start the ferment

  1. Add flour, salt, sugar, and yeast to the strained liquids.

  2. Pour the mixture into a jug and set it in a cool place.

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. Flour + sugartop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

  2. Potato + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together5,355 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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

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

  4. Hops + flourtop 32% of all pairs
    Smell alikelow
    Cooked together10 recipes

    Shared aroma: eugenol (clove, spicy).

  5. Hops + potatotop 39% of all pairs
    Smell alikelow
    Cooked together3 recipes

    Shared aroma: myrcene (balsamic, herbaceous).

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

What each ingredient does

Hops
Adds bitterness and aroma that balance the sweetness of the starter.
Potatoes
Supply starch that the yeast can break down into fermentable sugars.
Flour
Adds starch and body, thickening the mixture and giving the yeast more to work on.
Sugar
Provides quick food for the yeast, which turns it into carbon dioxide and alcohol.
Yeast
Ferments sugars into carbon dioxide and alcohol, causing the mixture to rise and developing flavour.

The step that matters

Add the yeast to the strained liquids. Yeast is a living organism. If the strained liquids are still very hot when the yeast goes in, the heat can kill it, and the mixture will not ferment properly.

Swap the potato

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

  1. Mustardfits better
  2. Arrowrootfits better
  3. Parsnipfits better
  4. Potatothe original

Fit is the average pairing score against hops, flour, 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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