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Good Yeast

A yeast starter made by boiling potatoes, mixing with flour, salt, sugar, and water, then adding yeast to ferment.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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 ↓

Good Yeast

Ingredients

Directions

Make the starter

  1. Boil and mash the potatoes finely.

  2. Mix the flour, salt, and sugar with the mashed potatoes.

  3. Pour in the boiling water while stirring to dissolve the mixture.

  4. Add the cold water and strain the mixture.

Ferment and store

  1. Once cool, add the yeast and set in a warm place to rise.

  2. When it is light, transfer to a jug or bottle and cork tightly.

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).

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

What each ingredient does

Potatoes
Provide starch and body that gives the starter a thick, nourishing base for the yeast.
Flour
Supplies starch that the yeast can feed on, adding body to the mixture.
Sugar
Feeds the yeast, helping it become active and produce gas for rising.
Yeast
Ferments the mixture, producing carbon dioxide that makes the starter rise and turn light.

The step that matters

Adding the yeast only once the mixture is cool. Yeast is killed by high heat, so adding it to the hot potato mixture can stop it from fermenting and the starter will fail to rise.

Swap the potato

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

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

Fit is the average pairing score against 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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