Why this matters
Before fixing anything, name the actual problem: too much water, too much heat, insufficient structure, poor storage, or an ingredient that cannot perform the original job. Then make the smallest useful correction. A careful repair preserves more food and teaches you something; random additions often create a second problem while hiding the first.
How to do it
Simmer uncovered for a few minutes so water evaporates before adding thickener. Stir and judge the sauce at serving temperature because many sauces thicken as they cool.
What to look, hear, or feel for
A reduced sauce coats the back of a spoon and leaves a trail when a finger passes through. Bubbles become slower as concentration increases.
When something goes wrong
If reduction would make it too salty, use a slurry or roux appropriate to the recipe instead. Add thickener gradually and let it fully activate before adding more.
Try it in a real meal
These techniques help with everyday sauces, leftovers, substitutions, and produce that needs a sensible plan.
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