Why it works: Butter and flour are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Turtle Soup
Ingredients
Directions
Prepare the turtle
Cut the head off the turtle and drain the body of blood.
Cut the turtle into pieces: back, belly, head, fins, and intestines.
Remove the gall without breaking it.
Scald the turtle parts in boiling water to remove skin and shell.
Cut the parts into neat square pieces and place them in cold water.
Make the soup
Boil the back and belly in a little water until the bones are easily removed.
Make a stock with the veal, ham, and turtle flesh, browning it well.
Add water and the liquor from the boiled turtle to the stock.
Work the butter and flour together, then add to the soup 10-12 minutes before serving.
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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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Veal + hamtop 15% of all pairsSmell alikelowCooked together3,264 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Ham + buttertop 16% of all pairsSmell alikemoderateCooked together5,475 recipes
Shared aroma: trans-2-decenal (waxy, orange).
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Flour + peppertop 19% of all pairsSmell alikemoderateCooked together50,459 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Veal + peppertop 19% of all pairsSmell alikemoderateCooked together10,049 recipes
Shared aroma: 2-nonenal (fatty, green).
Butter and flour barely smell alike, yet cooks put them together in 124,287 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
- Turtle
- Forms the main body of the soup and provides its meaty texture and rich flavour.
- Veal
- Adds body and savoury depth to the stock.
- Ham
- Contributes salty, smoky flavour to the stock.
- Butter
- Adds fat and richness, carrying flavour through the soup.
- Flour
- Thickens the soup as it cooks with the butter, giving it body.
The step that matters
Adding the butter and flour. Flour mixed with butter must be stirred in and given time to cook, or it stays raw-tasting and can form lumps. Adding it only 10-12 minutes before serving leaves little time to cook out the starch and thicken evenly, so the soup should be stirred steadily while it simmers.
“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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