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Drink

Hygienic Coffee

A beverage made by roasting, grinding, and brewing rye, corn, sweet potatoes, peas, and beans as a coffee substitute.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Sweet potato and beans match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 165 recipes. Both carry damascenone, which smells apple, rose. The science ↓

Hygienic Coffee

Ingredients

Directions

Prepare

  1. Roast the rye, corn, sweet potatoes, peas, and beans until browned.

  2. Grind the roasted ingredients to a fine powder.

Brew and serve

  1. Brew the ground mixture with hot water like regular coffee.

  2. Serve as an occasional drink.

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. Sweet potato + beanstop 1% of all pairs
    Smell alikestrong
    Cooked together165 recipes

    Shared aroma: damascenone (apple, rose).

  2. Corn + beanstop 3% of all pairs
    Smell alikestrong
    Cooked together1,211 recipes

    Shared aroma: 2,3-pentanedione (butter, sweet).

  3. Peas + beanstop 5% of all pairs
    Smell alikestrong
    Cooked together949 recipes

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

  4. Corn + sweet potatotop 6% of all pairs
    Smell alikestrong
    Cooked together153 recipes

    Shared aroma: 1-octen-3-ol (mushroom, earthy).

  5. Rye + beanstop 6% of all pairs
    Smell alikestrong
    Cooked together26 recipes

    Shared aroma: isoamyl acetate (banana, pear).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Rye
Roasting develops toasty, brown flavour similar to coffee's roasted notes.
Corn
Roasting browns the starch, adding a toasty, slightly sweet aroma.
Sweet potatoes
Roasting caramelises their natural sugars, adding sweetness and body to the brew.
Peas
Roasting browns them, contributing a nutty, toasted flavour to the blend.
Beans
Roasting browns them, contributing a nutty, toasted flavour and deeper colour.

The step that matters

Roast until browned. Browning drives the Maillard reaction and caramelisation, which create the roasted aroma and colour. Under-roasted ingredients taste raw and grassy, while over-roasted ones turn bitter and burnt.

Swap the peas

How well each one fits the dish's main ingredients (rye, corn, sweet potato, beans):

  1. Chickpeafits better
  2. Lentilsfits better
  3. Milletfits better
  4. Peasthe original

Fit is the average pairing score against rye, corn, sweet potato, beans. 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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