How do I fix a sauce that is too thin or too thick?

Consistency problems are easy to fix in both directions, but each correction affects the seasoning. Reducing concentrates salt; diluting weakens it. Adjusting the seasoning afterwards is the step people forget.

What you'll need

• Stock or water (optional)
• Cornflour (optional)
• Butter or cream (optional)

Step by step

1. For a thin sauce, reduce it first.Simmer uncovered. It thickens and concentrates the flavour at the same time, which no thickener does. Slowest option and the best result.
2. Use a cornflour slurry if you need speed.A tablespoon of cornflour mixed smooth with two of cold water, stirred in and simmered for a minute. Never add dry starch to hot liquid.
3. Blend some of the solids for a rustic sauce.A ladleful blended and returned thickens using what is already in the pan, with no added starch flavour.
4. Finish with cold butter for gloss and body.Whisked in off the heat. It thickens slightly and transforms the appearance, which is often what the sauce actually needed.
5. For a thick sauce, add liquid a splash at a time.Stock, cooking water, cream, or the liquid the dish already contains. It is very easy to overshoot into thin.
6. Use pasta or vegetable cooking water where relevant.It thins the sauce while adding starch, so it stays emulsified rather than going watery.
7. Re-season after any adjustment.Reducing concentrates salt, diluting weakens it. Taste and correct after adjusting the consistency, not before.
8. Judge consistency at serving temperature.Sauces thicken noticeably as they cool. A sauce that looks right at a rolling simmer is often too thick on the plate.

Tips

• Reduction is almost always better than thickening. It concentrates rather than dilutes, and it needs no extra ingredient.
• If a sauce is thin because it split, thickening will not help. Rebuild the emulsion first, then adjust consistency.
• Cornflour thins again if boiled hard or held for a long time. For a sauce that needs to sit, a flour-based thickener is more stable.

Common mistakes

• Adding dry cornflour or flour to hot liquid — It seizes into lumps immediately. Always mix starch with cold liquid first.
• Not re-seasoning after adjusting — Reducing concentrates the salt and diluting weakens it. Either way the seasoning is now wrong.
• Judging thickness while it is boiling hard — Sauces look thinner hot and thicken as they cool. Judge at a simmer and slightly under-thicken.

Questions people ask