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Mother's Yeast

A yeast starter made by mashing boiled potatoes with flour, water, and yeast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Potato and milk are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 3,611 recipes. Both carry (e,z)-2,6-nonadienal, which smells cucumber, melon. The science ↓

Mother's Yeast

Ingredients

Directions

The book gives no cooking times; the times in the steps were added in transcription, so check for doneness rather than trusting the clock.

Prepare the potato base

  1. Wash and boil the potatoes with the peelings on until tender.

  2. Mash the potatoes smooth with the flour.

  3. Add enough of the boiling water to make a batter.

Ferment and store

  1. Stir in the cold water.

  2. Dissolve the dry yeast in a little milk-warm water and add it to the mixture.

  3. Let the mixture rise for about 8 hours, stirring it at 11 o'clock.

  4. Strain through a sieve, pressing everything through except the peelings.

  5. Store in a jar with a lid in the refrigerator.

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 + milktop 9% of all pairs
    Smell alikemoderate
    Cooked together3,611 recipes

    Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).

  2. Flour + milktop 14% of all pairs
    Smell alikelow
    Cooked together78,219 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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

    Shared aroma: isobutyraldehyde (malty, green).

Flour and milk barely smell alike, yet cooks put them together in 78,219 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

Potatoes
Provide starch and body that thicken the batter and feed the yeast.
Flour
Adds starch that thickens the batter and gives the yeast material to work on.
Dry yeast
Ferments the starches and sugars, producing gas that makes the mixture rise.

The step that matters

Let the mixture rise for about 8 hours, stirring it at 11 o'clock.. Yeast needs time and warmth to multiply and ferment. Stirring redistributes the yeast and starch, so the batch rises evenly instead of separating or sitting in pockets.

Swap the potato

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

  1. Arrowrootfits better
  2. Potatothe original
  3. Sweet potatofits about as well
  4. Parsnipfits about as well

Fit is the average pairing score against flour, milk. 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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