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Preparation of Grape Syrup

A method for reducing grape must into a sweet syrup using ashes or chalk to neutralize acidity.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 3 ingredients
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Why it works: Grape and egg are a kitchen classic. They rank in the top 30% of all ingredient pairs, and cooks put them together in 4,690 recipes. Both carry (e)-2-octenal, which smells fatty, green. The science ↓

Preparation of Grape Syrup

Ingredients

Directions

Reduce the must

  1. Pour 12 pints of grape must into a large kettle on the stove.

  2. Add new must as it evaporates.

  3. Skim and stir to increase evaporation.

  4. Skim the liquid.

  5. Remove from heat.

Neutralize and clarify

  1. Add washed ashes, whiting, or powdered chalk in a bag until bubbling stops.

  2. Stir until the acid is neutralized.

  3. Test with blue paper that does not turn red.

  4. Return kettle to stove.

  5. Add 2 beaten eggs.

  6. Let settle briefly.

  7. Filter the liquid through woolen cloth in a wooden frame.

Finish and store

  1. Boil again to continue evaporation.

  2. Drop syrup from a spoon onto a plate.

  3. Observe that it should not break or spread out.

  4. Pour syrup into an unglazed earthenware vessel.

  5. Let cool completely.

  6. Transfer syrup to cleaned, dried bottles.

  7. Cork the bottles.

  8. Store in the cellar.

  9. Reverse the bottle neck each time you serve.

  10. Avoid long periods without emptying.

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. Grape + eggtop 30% of all pairs
    Smell alikelow
    Cooked together4,690 recipes

    Shared aroma: (e)-2-octenal (fatty, green).

  2. Whiting + eggtop 37% of all pairs
    Smell alikelow
    Cooked together340 recipes
  3. Grape + whitingtop 38% of all pairs
    Smell alikelow
    Cooked together8 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

What each ingredient does

Grape must
Is the base liquid that is reduced by evaporation into a concentrated, sweet syrup.
Washed ashes, whiting, or chalk
Neutralizes the acid in the must so the syrup tastes less sharp.
Eggs
Coagulate as they heat, trapping solid particles so they can be filtered out and clarifying the syrup.

The step that matters

Testing the syrup's consistency on a plate. Syrup that is not reduced far enough will run and spread on the plate, while overcooking makes it thick and sticky. Sugar concentration rises as water evaporates, so the drop test is the practical check for when to stop boiling.

Swap the grape

How well each one fits the dish's main ingredients (whiting, egg):

  1. Lemonfits better
  2. Limefits about as well
  3. Apricotfits about as well
  4. Grapethe original

Fit is the average pairing score against whiting, egg. 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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