How do I fix a sauce that is too acidic?

Over-acidity is one of the more fixable seasoning faults, because acid can be balanced by three different mechanisms. Choosing the right one depends on what the sauce is meant to taste like when you have finished.

Step by step

1. Taste it properly first.Sharp is not the same as thin, bitter or under-seasoned, and they get confused. Acid makes your mouth water and hits the sides of the tongue. If it is actually flat, more acid is the fix rather than less.
2. Add fat first.A knob of butter stirred in at the end, a splash of cream, a spoon of olive oil, or coconut milk in a curry. Fat coats the palate and rounds sharpness without making the sauce sweet. This is the fix that changes the flavour least.
3. Add a little sugar to balance.Half a teaspoon at a time in a tomato sauce, tasting between. Enough to balance and not enough to detect. Honey, a grated carrot or a little caramelised onion do the same thing more subtly.
4. Use bicarbonate of soda with real care.A pinch — genuinely a pinch — neutralises acid chemically. It foams up as it reacts, so add it off the heat and stir. Too much leaves a soapy, flat taste that cannot be corrected.
5. Dilute if the sauce can take it.More stock, more tomato, more of whatever the base is. It reduces acidity proportionally and it also dilutes everything else, so re-season afterwards.
6. Add a starchy element.Potato, rice, pasta or bread in the dish absorbs and buffers. Serving a sharp sauce over something starchy solves it on the plate rather than in the pan.
7. Add dairy for a cooked-out tomato sauce.The traditional Italian answer to a sharp tomato sauce is butter or a splash of milk rather than sugar. It works better and does not make the sauce taste sweet.
8. Cook it longer if the acid is raw.Tomato purée added late, or wine that has not reduced, tastes sharp because it is uncooked rather than because there is too much of it. Ten more minutes at a simmer often resolves it entirely.
9. Check what actually made it acidic.Wine added and not reduced, vinegar measured optimistically, tinned tomatoes from a sharp brand, or lemon added early rather than at the end. Knowing which prevents it next time.
10. Add the acid at the end next time.Vinegar and citrus should go in at the very end, off the heat, tasting as you go. Added at the start they concentrate as the sauce reduces, which is how sauces become too sharp.
11. Know when to stop.If it has taken fat, sugar and dilution and is still unpleasant, the balance has gone. Serve it over something absorbent, or start the sauce again — some are not recoverable.

Tips

• Butter finished into a sauce off the heat is the most useful single correction in home cooking. It fixes sharp, thin and slightly bitter at once.
• Different tinned tomato brands vary considerably in acidity. If your tomato sauces are consistently sharp, try a different brand before changing the recipe.
• Taste at room temperature where you can. A very hot sauce reads as less acidic than it will on the plate.

Common mistakes

• Adding too much bicarbonate of soda — It neutralises the acid and then keeps going, leaving a soapy, flat taste that no further seasoning corrects. A pinch, off the heat, stirred in.
• Reaching for sugar first — It balances but is easy to overshoot into sweetness. Fat rounds the sharpness without pushing the flavour in a new direction.

If it doesn't work

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