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Yeast for Bread

A yeast starter made by fermenting grated potatoes with flour, sugar, and hops.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 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 for Bread

Ingredients

Directions

  1. Grate the potatoes in a colander and let the water drip off.

  2. Add the flour and sugar to the grated potatoes.

  3. Boil the hops in water for 20 minutes, then pour over the potato mixture.

  4. Mix well and let it sit until bubbly.

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. Flour + hopstop 32% of all pairs
    Smell alikelow
    Cooked together10 recipes

    Shared aroma: eugenol (clove, spicy).

  5. Potato + hopstop 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

Potatoes
Supply starch and moisture that the wild yeasts and bacteria ferment.
Flour
Adds more starch and proteins for the microbes to feed on, thickening the mixture.
Sugar
Provides quick-to-use food that speeds up fermentation and bubbling.

The step that matters

Let it sit until bubbly. Bubbles show that yeasts are converting sugars and starches into carbon dioxide. Stopping early leaves the starter under-fermented and weak, so wait until bubbling is clearly visible before using it.

Swap the potato

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

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

Fit is the average pairing score against flour, sugar, hops. 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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