Too Much Sumac? How to Fix a Dish That’s Too Sour or Astringent

Hummus gone sharply sour, with a dry pucker in every bite? Good news: too much sumac is easier to fix than most spice mistakes, because it usually goes on at the end and the overdose sits right on the surface. Scrape it off, or dilute. When it’s cooked in, a pinch of sugar helps more than more lemon or a dose of baking soda. And check your recipe first: some dishes use 3 tablespoons on purpose.

Quick answer

Why sumac takes over

Sumac tastes tart and sour, with slightly astringent overtones.¹ A 2021 review says malic acid accounts for that sour taste.²

How much is “too much” depends on the dish. In some cuisines the ground fruit gets sprinkled liberally over rice,¹ and Sami Tamimi’s musakhan uses 3 tablespoons of sumac for four servings.³ If a sumac-heavy recipe tastes sour, check whether it’s supposed to before you call it a mistake.

Check the jar for salt

Sumac is sometimes sold with salt in it. Katzer notes it’s often mixed with salt.¹ Two labels:

Spices Inc. says its sumac is processed with salt to prevent fermentation. That’s still very little salt. At 76.4 mg of sodium per teaspoon, against 590 mg per quarter teaspoon of Morton table salt, it’s about 3% of table salt’s sodium spoon for spoon.⁴⁶ So if a sumac-heavy dish tastes salty, the salt is mostly coming from something else. Fix it with dilution first; see too much salt.

Too much on top

When sumac is a finishing sprinkle, most of an overdose can come straight off. Hummus is the classic case: Eden Grinshpan finishes hers with olive oil and “a juicy pinch of sumac.”⁷ Scrape the extra from hummus or labneh with the edge of a spoon, lift the top layer off a rice dish, or toss an over-dusted salad with more leaves, cucumber and tomato. Then add more oil if the dish uses it.

Sour all through: dilute, then sweeten

When the sumac is cooked in, as in Tamimi’s musakhan, where it goes into the onions,³ or whisked into a dressing, you can’t scrape it off.

Dilute. Adding more of every other ingredient is the one fix that lowers the sumac in each bite. More onions and oil for musakhan onions, more oil and herbs for a dressing, more yogurt and garlic for a marinade. If the pan won’t hold more, cook a second batch without sumac and combine them, the method Tasting Table gives for too much garlic.⁸

Sweetness. In controlled taste tests with pure solutions, sugar significantly cut each of the other basic tastes it was mixed with, including the sourness of citric acid.⁹ The same study found sugar the dominant suppressor overall. Those were lab solutions, not food, and the acid was citric, not sumac’s malic acid. Start with a pinch of sugar, or a little honey or pomegranate molasses where it suits the dish, and taste after each addition.

Salt, only if the dish needs it. In a 1967 study, salt sharply reduced how sour salt-and-acid mixtures tasted, in water and in a green bean purée.¹⁰ If the dish is under-salted, a pinch more salt can help with the sourness too. If it’s already well salted, skip this.

Dry and puckery

The astringent edge is the hardest part to fix, because we didn’t find a tested remedy for it. Dilution is the only fix with a clear basis. Rich, smooth ingredients make the dryness less noticeable: more olive oil on the dish, a spoonful of yogurt or tahini alongside, or some avocado in a salad. No source we found tests fat or dairy against astringency or sourness, so think of this as balance, not removal.

Fixes that don’t hold up

Baking soda to neutralize the acid. Baking soda does cut acidity. America’s Test Kitchen found even a small amount significantly raised the pH of tomato sauce. But tasters found the soda-treated sauce a little flat next to sauce sweetened with sugar.¹¹ We found no test on sumac, and sourness is the whole reason to use sumac. Use sugar instead.

Chili heat to distract from it. In a 1995 taste study of chili irritation, capsaicin didn’t affect sourness.¹² Add heat and you’ve got a dish that’s sour and hot.

More lemon to “brighten” it. Lemon adds more sourness to a dish that already has too much. Save it for a dish that tastes flat.

A potato to soak it up. The trick comes from oversalted soup, and even there, in Robert Wolke’s experiment as Sara Moulton reports it, potatoes soaked up some of the salty water and didn’t selectively remove the salt.¹³ A Tasting Table writer calls it “more of an aid than a final answer.”¹⁴ We found no test of a potato against acid, so count any potato in a stew as dilution.

Preventing it next time

Use a named recipe’s amount as a guide. Amounts vary enormously with the dish:

Split cooked-in and finishing sumac. Tamimi cooks 2 tablespoons of the sumac into the onions and sprinkles 1 1/2 teaspoons over the finished dish.³ Sprinkle the last part at the table and everyone can decide how sour they want it.

Watch the sumac in za’atar too. Za’atar recipes disagree on the sumac. America’s Test Kitchen’s uses 1 1/2 tablespoons in its batch,¹⁶ The Spice House’s small batch 1/4 teaspoon.¹⁷ If a recipe calls for both sumac and za’atar, check how sour your za’atar is before adding the full amount of sumac.

Related

• Sumac, sumac substitutes, sumac uses and cooking with sumac
• Za’atar
• Too much vinegar, too much tamarind, too much salt

Footnotes

1. Gernot Katzer, Sumac (Rhus coriaria L.), Gernot Katzer’s Spice Pages. gernot-katzers-spice-pages.com · Reference work ↩ ↩² ↩³

2. Alsamri H et al., Pharmacological and Antioxidant Activities of Rhus coriaria L. (Sumac), Antioxidants, 2021. mdpi.com · Peer-reviewed ↩

3. Sami Tamimi, Palestinian chicken musakhan, Gulf News, 2021. gulfnews.com · Publication ↩ ↩² ↩³ ↩⁴

4. Ground Sumac, product page, Spices Inc. spicesinc.com · Merchant ↩ ↩² ↩³

5. Schwartz Sumac 46 g, ingredients and nutrition, via SuperValu. shop.supervalu.ie · Merchant ↩ ↩²

6. Morton Iodized Table Salt, product page, Morton Salt. mortonsalt.com · Merchant ↩

7. Eden Grinshpan, Hummus with Chopped Salad, Tahini, Lemon and Sumac, House & Home, 2025. houseandhome.com · Publication ↩ ↩²

8. Harmony Colangelo, Simple Ways To Tone Down The Pungency Of Garlic, Tasting Table, 2023. tastingtable.com · Publication ↩

9. Green BG et al., Taste Mixture Interactions: Suppression, Additivity, and the Predominance of Sweetness, Physiology & Behavior, 2010. pmc.ncbi.nlm.nih.gov · Peer-reviewed ↩

10. Pangborn RM, Trabue IM, Detection and apparent taste intensity of salt–acid mixtures in two media, Perception & Psychophysics, 1967 (abstract). doi.org · Peer-reviewed ↩

11. How to Make Tomato Sauce Less Acidic, America’s Test Kitchen. americastestkitchen.com · Publication ↩

12. Prescott J, Stevenson RJ, Effects of oral chemical irritation on tastes and flavors in frequent and infrequent users of chili, Physiology & Behavior, 1995 (abstract). researchers.mq.edu.au · Peer-reviewed ↩

13. Sara Moulton, Oversalted it? There is one solution, saramoulton.com, 2012 (updated 2016), reporting Robert L. Wolke’s experiment. saramoulton.com · Publication ↩

14. Alison Spiegel, How To Fix An Oversalted Soup, Tasting Table, 2016. tastingtable.com · Publication ↩

15. Yotam Ottolenghi and Sami Tamimi, Roast Chicken with Sumac, Za’atar and Lemon, via The Splendid Table. splendidtable.org · Publication ↩

16. Bryan Roof, Za’atar, America’s Test Kitchen, 2017. americastestkitchen.com · Publication ↩

17. Za’atar Substitute, The Spice House, 2020. thespicehouse.com · Merchant ↩