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Old-fashioned Yeast

A homemade yeast starter made from potatoes, sugar, salt, hops, and Royal Yeast cake.

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 ↓

Old-fashioned Yeast

Ingredients

Directions

Prepare

  1. Tie the hops in a piece of cheesecloth and cook them with the potatoes in boiling water.

  2. Once the potatoes are done, drain them using a colander.

  3. Add the coarse sea salt and granulated sugar to the drained potatoes.

Make the starter

  1. When the mixture is lukewarm, add the dissolved Royal Yeast cake.

  2. Let the mixture stand in a warm place until ready for use.

  3. Store the mixture in a cool place.

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).

  2. Potato + hopstop 39% of all pairs
    Smell alikelow
    Cooked together3 recipes

    Shared aroma: myrcene (balsamic, herbaceous).

  3. Sugar + hopstop 43% of all pairs
    Smell alikelow
    Cooked together6 recipes

    Shared aroma: guaiacol (smoky, sweet).

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 feeds the yeast and gives the starter its base.
Royal yeast cake
Supplies the live yeast that ferments the mixture and makes it rise.
Granulated sugar
Provides readily available food for the yeast, speeding up fermentation.
Hops
Adds bitter and aromatic flavor notes and helps preserve the starter.

The step that matters

Add the yeast only when the mixture is lukewarm. Yeast is killed by high heat, so adding it to a very hot mixture can stop fermentation before it starts. Lukewarm liquid lets the yeast stay active and begin working.

Swap the potato

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

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

Fit is the average pairing score against sugar, hops. 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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