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 ↓
Yeast
Ingredients
Directions
Pare and grate the potatoes.
Boil the hops in 1 quart of water.
Strain the hop water over the grated potatoes and stir until it scalds.
Remove from heat and add brown sugar and ginger.
Let it cool, then add the brewer's yeast.
Store in a half-gallon jug, corked and tied down, in a cool place.
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 body that feed the yeast as the starter develops.
- Hops
- Add bitterness and aroma, and help preserve the starter against spoilage.
- Brewer's yeast
- Ferments the sugars in the mixture, producing carbonation and flavor.
- Brown sugar
- Gives the yeast readily available sugar to ferment and adds a molasses note.
The step that matters
Stirring the hop water into the potatoes until it scalds. Scalding the grated potatoes gelatinizes their starch so yeast can access it. Adding yeast while the mixture is still hot would kill it, which is why the mixture must cool first.
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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