Why it works: Potato and ginger work together. They rank in the top 12% of all ingredient pairs, and cooks put them together in 992 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
To Make Yeast
Ingredients
Directions
Make the potato base
Pare and boil the potatoes until soft, then mash them finely.
Steep the hops in about 1 quart of the potato water for a few minutes.
Mix the mashed potatoes with salt, sugar, ginger, flour, and cold water.
Strain the hop water over the potato mixture and stir well.
Scald the mixture over a kettle of boiling water, stirring occasionally.
Ferment and store
Once cool, add yeast to raise it.
When light, transfer to a jug and seal with a cork.
Store in the refrigerator during warm weather.
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.
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Potato + gingertop 12% of all pairsSmell alikemoderateCooked together992 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Sugar + flourtop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Potato + flourtop 15% of all pairsSmell alikemoderateCooked together5,355 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Ginger + flourtop 15% of all pairsSmell alikemoderateCooked together8,564 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Sugar + gingertop 17% of all pairsSmell alikelowCooked together14,054 recipes
Shared aroma: 1-penten-3-one (fish, pungent).
Sugar and ginger barely smell alike, yet cooks put them together in 14,054 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 bulk that feed the yeast and give the starter body.
- Hops
- Add bitterness and aroma, and help preserve the starter against spoilage.
- Sugar
- Provides food for the yeast, driving fermentation and rising.
- Flour
- Adds starch and body, thickening the mixture into a workable starter.
The step that matters
Scald the mixture before adding yeast. The mixture must be cool enough that heat does not kill the yeast when it is added. Adding yeast to hot liquid can stop fermentation before it starts.
Swap the potato
How well each one fits the dish's main ingredients (hops, sugar, ginger, flour):
- Mustardfits better
- Arrowrootfits better
- Parsnipfits better
- Potatothe original
Fit is the average pairing score against hops, sugar, ginger, flour. 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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