
Sharp red onions become a bright, cool side dish through a quick yet impressive prep method. This classic Turkish offering turns basic onions into a tangy topping that makes any meal better with its mix of lemony sumac, green herbs, and soft onions. Every mouthful packs a punch that turns this from a simple onion mix into a must-have for your spread of small plates or barbecue dinner.
Since finding this dish during my trip around Istanbul, I've whipped it up so many times. What really won me over was seeing my spice-shy kid go for another helping, saying these onions were 'pretty tasty!'
Key Ingredients and Shopping Advice
- Red Onions: Go for solid, weighty ones with snug, glossy skins for top results. Red varieties offer lovely color and just the right mix of sweet and sharp.
- Sumac: Hunt for vibrant, deep red sumac with a citrusy smell. Markets focusing on Middle Eastern foods usually sell the most aromatic kinds.
- Fresh Parsley: Pick flat-leaf parsley with bright green leaves and firm stems. Its bold taste works well against the onions.
- Extra Virgin Olive Oil: Grab good quality oil with a smooth, light taste for the best outcome.

Step-by-Step Cooking Guide
- Onion Preparation:
- Grab a keen knife or food slicer to cut onions super thin, which helps them soak up flavors evenly. Cut with the grain for the prettiest look.
- Sumac Massage:
- Dust your sliced onions well with sumac and a bit of salt. Rub gently for 2-3 minutes to soften them and let the flavor sink in.
- Resting Period:
- Set the onions aside for 10-15 minutes. During this time, they'll drop their juice and turn nice and soft.
- Final Seasoning:
- Pour oil and fresh lemon juice over onions, then mix lightly to cover. Toss in newly chopped parsley right before you serve.
Last summer, I watched my Turkish friend make this salad for a family party. She taught me that onions should be thin enough to almost see through - this has become my go-to test for cutting them just right.
Smart Tricks for Better Results
- Drop onion slices in cold water with ice for 10 minutes before adding spices to cut the bite while keeping them crunchy.
- Try other fresh herbs like mint for a cool taste or dill for more aroma.
- Keep the onion liquid that gathers at the bottom of your bowl - it works great in salad dressings.
This sumac onion mix shows how careful handling can turn basic stuff into something amazing. Whether you're putting it on a plate of small bites or using it with grilled chicken, this dish adds strong, fresh flavors that wake up your taste buds and turn any meal into something special.

Frequently Asked Questions
- → What exactly is sumac and where can I buy it?
- Sumac is a tart, deep red spice ground from sumac berry clusters. You'll find it at Middle Eastern shops, fancy spice stores, or in the international aisle of bigger grocery stores.
- → How long will these sumac onions keep?
- They'll stay good in the fridge for about 4 days if you keep them in a sealed container. Just drain off extra liquid before you use them.
- → Why should I massage the onions?
- Massaging softens the onions and helps them soak up the sumac flavor better, giving you tenderer, tastier onions.
- → Can I make the onions less pungent?
- Sure, just soak your sliced onions in cold water for 10 minutes before you add the sumac and they'll taste milder.
- → What foods taste best with sumac onions?
- They're great with grilled meats, falafel, hummus, inside sandwiches, on top of salads, and with other Middle Eastern foods.