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Home-brewed Yeast

A homemade yeast starter made from boiled potatoes, sugar, salt, and water.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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 ↓

Home-brewed Yeast

Ingredients

Directions

Make the mixture

  1. Mix the grated potatoes, sugar, and salt in a bowl.

  2. Pour the boiling water over the mixture to create a thick consistency.

  3. Add the cold water to thin it to the right consistency.

  4. When lukewarm, add the yeast and mix well.

Rise and store

  1. Set the mixture in a warm place to rise.

  2. Once risen, transfer it to a clean glass jar and store in a cool place.

  3. Discard if it becomes watery or has a strong sour smell.

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 that the yeast feeds on, giving the mixture its thick base.
Sugar
Feeds the yeast so it becomes active and starts fermenting.
Liquid yeast
Starts the fermentation that makes the mixture rise and develop flavour.

The step that matters

Adding the yeast when lukewarm. Yeast is killed by high heat, so the mixture must be cool enough to add it safely. If it is still hot, the yeast may die and the mixture will not rise properly.

“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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