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Pure Potato Yeast

A yeast starter made by boiling and mashing potatoes, then adding water, sugar, and yeast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Potato and sugar are a kitchen classic. They rank in the top 30% of all ingredient pairs, and cooks put them together in 3,032 recipes. Both carry beta-damascenone, which smells apple, rose. The science ↓

Pure Potato Yeast

Ingredients

Directions

  1. Slice the potatoes and boil them until tender.

  2. Drain all the water and mash the potatoes through a colander.

  3. Stir in the boiling water, then add the cold water and sugar.

  4. When the mixture is lukewarm, add the yeast.

  5. Leave it in a warm place for 2–3 hours until bubbles form on the surface.

  6. Transfer to a jug and keep in a cold place, loosely corked for the first 12 hours, then press the cork firmly in.

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 + 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, mashed texture that feeds the yeast.
Yeast
Ferments the sugar, producing gas that forms bubbles and makes the starter rise.
White sugar
Provides food for the yeast, fuelling fermentation.

The step that matters

Adding the yeast while the mixture is lukewarm. Yeast is killed by high heat, so adding it to a hot mixture can stop fermentation. A lukewarm mixture is warm enough to activate the yeast without harming it.

“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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