Because things break.
Too thin. Too thick. Too salty. Split. Bitter. Over-reduced. Under-seasoned.
This section is about fixing mistakes and understanding ratios so you don't repeat them. Roux math. Vinaigrette ratios. Reduction percentages.
Recipes are helpful.
Ratios are power.
Stop the process that is making the problem worse. Taste a small cooled spoonful. Diagnose thickness, salt, acidity, or separation before adding three new ingredients and losing the audit trail.
| Symptom | Likely issue | Useful fix |
|---|---|---|
| Too thin | Not enough reduction, or not enough thickener | For an unsalted reduction, simmer longer. For a flour sauce, simmer fully before adding more thickener. |
| Too thick | Too much evaporation or thickener | Whisk in the original liquid a tablespoon at a time: milk for bechamel, water or unsalted stock for jus. |
| Too salty | Salt concentrated during reduction | Dilute with an unsalted base or make more sauce without salt. Potatoes are not selective salt filters. |
| Too acidic | Acid out of balance | Add more unacidified base or a little fat. A small pinch of sugar can balance perception; it does not remove acid. |
| Greasy or split | Too much heat, fat added too quickly, or too little water | Stop heating. For a butter sauce, whisk in a teaspoon of water. For mayonnaise, rebuild around a fresh pasteurized yolk. |
| Lumpy | Flour clumped before dispersing | Whisk, then strain. A blender may help flour lumps; it cannot unburn a sauce. |
| Burnt or bitter | Scorched garlic, roux, sugar, or pan residue | Transfer without scraping if only the bottom caught. If the bitterness is throughout, start again. |
| Flat | Often missing seasoning or acidity | Test a pinch of salt in one spoonful. Then test a few drops of acid. Scale up only the improvement. |
Scale factor = desired yield ÷ original yield
For 750 ml from a 500 ml recipe, multiply ingredients by 1.5. Do not multiply simmering time by 1.5: evaporation depends on pan area and heat. Season near the end.
Equal weights of butter and flour make a practical starting roux. For 500 ml milk or light stock, use about 20 g each for a light sauce, 30 g each for medium body, or 40 g each for a thick filling. These are starting points for pale roux; darker roux thickens less.
To add body to an already-cooked sauce, cook a small extra roux separately, whisk some sauce into it until smooth, then combine and simmer until the flour taste is gone. Sprinkling raw flour straight into the pot mostly manufactures lumps.
For 120 ml dressing, begin with 90 ml oil and 30 ml acid. For 240 ml, use 180 ml oil and 60 ml acid. Taste on a leaf and adjust. Mustard helps the mixture stay together; it does not repeal gravity.
Reduction % = (starting volume − final volume) ÷ starting volume × 100
Reducing 500 ml to 250 ml removes 50% of the volume. Reducing it to 125 ml removes 75%. “Reduce by half” and “reduce to half” happen to agree; most other fractions do not.
As a rough model, halving the volume doubles salt concentration. If the sauce is already salty enough, stop reducing. Thickening and concentrating are different jobs.
For about 250 ml thin sauce, mix 1 tsp cornstarch with 1 tbsp cold water. Whisk in half, bring to a gentle boil for about a minute, and check before adding more. It changes texture and is not a substitute for gelatin-rich jus, but dinner does not require a purity tribunal.
Refrigerate perishable sauces within 2 hours, or within 1 hour above 90°F / 32°C. Use shallow containers and keep the refrigerator at 40°F / 4°C or below. A large stockpot cools slowly; divide the batch. For cooked leftovers, use within 3–4 days or freeze. Bring reheated cooked sauces to a rolling boil. USDA leftover guidance.
Use pasteurized yolks for mayonnaise, Caesar, hollandaise, and bearnaise. Acid and gentle warming are not a validated pasteurization process. FDA egg guidance.
For this collection, use cold egg dressings within 2 refrigerated days and fresh herb sauces within 3. Make warm egg sauces just before serving; discard leftovers from service. These shorter windows also favor texture. Butter emulsions are best fresh; store a pan-sauce base before adding butter when possible.
Reduction does not make sauce shelf-stable. Fresh garlic in oil still belongs in the fridge. These recipes are for immediate use, refrigeration, or freezing, not canning.