How to fix a salsa that went wrong

Diagnosis first. Most salsa problems have one cause and one fix, and applying the wrong fix — usually more salt or more lime — makes things worse.

It tastes bitter

The most common complaint, and it has three separate causes.

Burnt chiles. If you scorched them on the comal, this is unfixable. Sugar, salt and acid all fail. The batch is finished — start again, and next time toast for seconds over medium-low heat, going by smell rather than color.

Unrinsed tomatillos. The sticky film under the husk is genuinely bitter. If the salsa is already made, half a teaspoon of sugar and a squeeze of lime will mostly cover it. Next time, rub them under running water until they stop feeling slippery.

Over-blended cilantro. Pulverized cilantro turns bitter and dull green. Add half an avocado or a spoonful of crema to round it out. Next time, cilantro goes in last and gets two pulses.

There is also the case where the chile itself is bitter by nature — pasilla and chipotle meco both carry a natural bitterness. That is not a fault, and the fix is a teaspoon of piloncillo, which is why both of those salsas call for it.

It is watery

Diagnosis: too much liquid, added too early.

• Blend in two raw tomatillos or half a roasted tomato. This adds pectin and body without adding water.
• Or fry it: two tablespoons of oil, hot, pour the salsa in, cook 5 to 8 minutes. Evaporation thickens it and improves the flavor at the same time. This is the better fix.
• A tablespoon of ground pumpkin seed or peanut thickens it and adds flavor, though it changes the salsa.

Prevention: blend dry first, add liquid by the tablespoon at the end. Water cannot be removed once it is in.

A second cause: burst tomatillos. Boiled too long, they leave their body in the water and the salsa will never thicken. Stop boiling when the first one splits.

It tastes flat

Diagnosis: almost always salt, occasionally acid.

Add salt first, wait thirty seconds, taste again. People reach for lime when the problem is salt, and end up with a sour, still-flat salsa.

If it is properly salted and still dull, then:

• Acid: a teaspoon of lime, or apple cider vinegar for a cooked red salsa.
• A pinch of sugar in a dark or smoky salsa, which lifts the aromatics forward.
• Fry it if it is a raw blended salsa — the raw taste is often what reads as flat.

It is too hot

Nothing removes capsaicin. Every option is dilution or masking.

• Fat works best: oil, avocado, crema, cheese.
• A teaspoon of sugar in a cup and a half, which will not taste sweet.
• More of the base — roasted tomato or boiled tomatillo blended in.

Do not add salt, lime or water. Salt and acid both increase the perception of heat, and water thins the salsa without dissolving the capsaicin.

Full detail on the heat guide.

It has separated

Water on top, solids underneath. Normal for most salsas after a day in the fridge — just stir.

If it separates within minutes of blending, the emulsion never formed:

• Blend for another full minute. Most people under-blend.
• For a creamy salsa, add half an avocado or a spoonful of mayonnaise, which stabilizes it.
• If it is a fatty salsa that broke, blending in a spoonful of the base liquid slowly, with the motor running, sometimes brings it back.

It turned brown

Avocado salsas and guacamole. Oxidation. Lime slows it and pressing plastic wrap flat onto the surface — not stretched over the rim — slows it much more. The pit does nothing; that is a myth.

Green salsas. Blending hot tomatillo, or over-blending cilantro. Cool the tomatillos five minutes before they meet anything green.

Once brown, it is cosmetic rather than spoiled. It tastes fine and looks tired.

It is gritty

Diagnosis: unstrained dried chile skins.

Guajillo, puya and costeño have thin, tough skins that no blender breaks down. Push the salsa through a medium sieve with the back of a spoon. Two minutes of work and it is the biggest single texture improvement available.

If it is gritty and there are no dried chiles in it, the cause is usually under-ground seeds — pumpkin seed or sesame that was blended wet instead of ground dry first.

It tastes like chili powder

Diagnosis: too much cumin.

Cumin is used far more heavily in Tex-Mex and American chili than in Mexican salsa. An eighth of a teaspoon is a background note; half a teaspoon takes over completely.

There is no fix once it is in. Dilute with more base, or accept it. Next time, use a fraction of what feels right, or leave it out — most salsas on this site are complete without it.

The two things nothing fixes

Burnt chiles. Said again because it is the one people try hardest to rescue. The bitterness is chemically stable and it is in every drop. Throw it out.

Over-salted salsa. Adding a potato does not work; that is folklore. The only real fix is making more unsalted salsa and combining, which means you needed twice as much salsa as you wanted.

The order to work in

When something is wrong and you cannot name it:

1. Salt. Taste again. This solves it more often than anything else.
2. Acid. A little lime.
3. Fat. A spoonful of oil or avocado.
4. Sugar. A pinch, especially in dark or smoky salsas.
5. Heat — fry it — if it still tastes raw.

Add one thing at a time and taste between each. Fixing three things at once means you learn nothing and usually overshoot.