Why it works: Onion and vinegar are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 18,226 recipes. Both carry acetic acid, which smells sour, vinegar. The science ↓
Onion Pickle
Ingredients
Directions
Prepare the onions
Peel the onions.
Scald the onions in strong salt water for 25-30 minutes.
Remove the onions.
Lay the onions on dishes in the sun for 1-2 days.
Pour boiling water over the onions.
Let the onions sit until the brine cools.
Brine and soak
Change the brine.
Warm the brine each day for 9 mornings.
Soak the onions in fresh water for 1 day and night.
Pickle and finish
Boil the spices and vinegar.
Add the onions for a few minutes.
Add sugar to taste.
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.
-
Onion + vinegartop 14% of all pairsSmell alikemoderateCooked together18,226 recipes
Shared aroma: acetic acid (sour, vinegar).
-
Vinegar + sugartop 15% of all pairsSmell alikemoderateCooked together20,806 recipes
Shared aroma: beta-damascenone (apple, rose).
-
Onion + sugartop 36% of all pairsSmell alikelowCooked together15,747 recipes
Shared aroma: guaiacol (smoky, sweet).
Onion and sugar barely smell alike, yet cooks put them together in 15,747 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
- Onions
- Form the main body of the pickle and absorb the brine and vinegar flavours as they soften.
- Vinegar
- Provides the sharp acidity that preserves the onions and defines the pickle's tang.
- Sugar
- Balances the sharpness of the vinegar with sweetness, added to taste.
The step that matters
Scalding the onions in strong salt water. Salt draws water out of the onions and firms their texture, while too long or too hot a scald can make them limp. Timing matters because the onions must stay crisp enough to hold their shape through the later soaking and pickling.
Swap the onion
How well each one fits the dish's main ingredients (vinegar, sugar):
- Mustardfits better
- Capsicumfits better
- Cucumberfits better
- Onionthe original
Fit is the average pairing score against vinegar, sugar. 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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