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Farmers' Yeast

A yeast starter made by boiling hops, potatoes, and flour, then cooling and adding yeast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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Why it works: Potato and ginger work together. They rank in the top 12% of all ingredient pairs, and cooks put them together in 992 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Farmers' Yeast

Ingredients

Directions

Make the hop water

  1. Boil the hops in water with the potatoes until the potatoes are well cooked.

  2. Mash the potatoes and hops together, then strain through a linen strainer.

Make the batter

  1. Add enough flour to make a thick batter, then stir in salt, ginger, and sugar.

  2. Bring the mixture to a boil while stirring constantly, then set aside to cool.

Add yeast and rise

  1. When the mixture is warm (not hot), add the yeast.

  2. Let it sit for 2 to 3 hours until light.

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. Potato + gingertop 12% of all pairs
    Smell alikemoderate
    Cooked together992 recipes

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

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

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

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

    Shared aroma: isobutyraldehyde (malty, green).

  4. Flour + gingertop 15% of all pairs
    Smell alikemoderate
    Cooked together8,564 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Ginger + sugartop 17% of all pairs
    Smell alikelow
    Cooked together14,054 recipes

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

Ginger and sugar barely smell alike, yet cooks put them together in 14,054 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

Hops
Provide bitterness and natural yeast-friendly compounds that help flavor and preserve the liquid.
Potatoes
Supply starch that thickens the mixture and feeds the yeast as it ferments.
Flour
Forms the thick batter that gives the yeast a body to work in and rise through.
Sugar
Feeds the yeast, driving fermentation and the gas that makes the batter light.
Yeast
Ferments the sugars, producing carbon dioxide that leavens the batter.

The step that matters

Adding the yeast when the mixture is warm, not hot. Yeast is killed by high heat, so the mixture must be cooled to lukewarm before adding it. Adding yeast too hot can stop fermentation and leave the batter flat.

Swap the potato

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

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

Fit is the average pairing score against hops, flour, ginger, 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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