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Bread

Yeast

A yeast-based sponge made from potatoes, sugar, water or beer, used as a starter for bread.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 3 ingredients
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Why it works: Potato and beer work together. They rank in the top 14% of all ingredient pairs, and cooks put them together in 145 recipes. Both carry 2-isobutyl-3-methoxypyrazine, which smells green bell pepper, earthy. The science ↓

Yeast

Ingredients

Directions

Prepare the potatoes

  1. Boil and peel the potatoes.

  2. Mash the potatoes finely.

Make the sponge

  1. Add enough water or beer to achieve a yeast-like consistency.

  2. Stir in 2 tablespoons of yeast when the mixture is warm.

  3. Keep the mixture warm until fermentation is complete, about 24 hours.

Rest and use

  1. Set the sponge 8 hours before baking bread.

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 + beertop 14% of all pairs
    Smell alikemoderate
    Cooked together145 recipes

    Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).

  2. Sugar + beertop 22% of all pairs
    Smell alikelow
    Cooked together699 recipes

    Shared aroma: beta-damascenone (apple, rose).

  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

Mealy potatoes
Provide starch and moisture that the yeast feeds on during fermentation.
Coarse sugar
Feeds the yeast and speeds fermentation, adding a little sweetness.
Water or beer
Hydrates the mashed potato to a loose, yeast-like consistency.
Yeast (in the method)
Ferments the mixture, producing gas that helps the bread rise.

The step that matters

Keep the mixture warm until fermentation is complete. Yeast activity slows sharply when the mixture cools, so fermentation can stall and the sponge may not become bubbly and active. Keeping it warm lets the yeast multiply and produce the gas needed for a well-risen bread.

Swap the potato

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

  1. Mustardfits better
  2. Capsicumfits better
  3. Horseradishfits about as well
  4. Potatothe original

Fit is the average pairing score against sugar, beer. 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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