Why it works: Flour and onion are a kitchen classic. They rank in the top 17% of all ingredient pairs, and cooks put them together in 32,460 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Sauce Robert
Ingredients
Directions
Heat a stewpan over medium heat.
Add flour and stir until it turns a brownish color.
Add the minced onions and continue to cook, stirring frequently.
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.
-
Flour + oniontop 17% of all pairsSmell alikemoderateCooked together32,460 recipes
Shared aroma: isobutyraldehyde (malty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Flour
- Browns in the hot pan and thickens the sauce as it cooks.
- Onions
- Soften and release sweetness as they cook, adding body and flavor to the sauce.
The step that matters
Browning the flour. Flour that is stirred over heat turns from pale to brown, and the colour and nutty flavour develop gradually. Stopping too early leaves a raw, starchy taste, while going too far can scorch it and make the sauce bitter.
“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.
You might also like
Wine Sauce (for stewed fruit)186 recipes
Caper Sauce180 recipes
Brown Sauce141 recipes
Dutch Sauce74 recipesThe free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.