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Lizzie's Potato Yeast

A yeast made by mixing mashed potatoes, flour, sugar, salt, water, and yeast, then allowing it to rise.

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 ↓

Lizzie's Potato Yeast

Ingredients

Directions

Prepare the potatoes

  1. Boil and mash the potatoes.

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

  3. Add 1 pint of boiling water, then 1 pint of cold water.

  4. Stir in the yeast.

Rise and store

  1. Set the mixture in a warm place to rise for a few hours until frothy.

  2. Once risen, store in a cool place.

  3. Use within a few days.

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, giving the starter a thick, nourishing base for the yeast to feed on.
Flour
Adds starch that the yeast can break down, helping the mixture thicken and ferment.
Sugar
Feeds the yeast, speeding up fermentation and the froth that forms as it rises.
Yeast
Ferments the starches and sugars, producing gas that makes the mixture rise and turn frothy.

The step that matters

Set the mixture in a warm place to rise. Yeast works fastest in a warm environment. Too cold and fermentation stalls; too hot and the yeast can die, so the rise stays sluggish or fails.

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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