Peel and cut 2 medium red onions in half, then cut them into thin slices.
Rub or pinch the onions to separate their layers, then rinse them under cold water.Transfer them to a bowl and add 4 tablespoons fresh lemon juice, 1 tablespoon sumac, and ½ teaspoon sea salt.Mix well, then let the onions marinate for 20 to 30 minutes.
Stir in 1 tablespoon extra virgin olive oil and 1 cup flat-leaf parsley (finely chopped).
Serve as side dish or topping for salads, soups, stews, roasted veggies, spreads, in sandwiches and wraps.
Nutrition information is an estimate for 1 serving of sumac onions out of 4 servings.STORAGE & MAKE AHEADMake ahead: Sumac onions are excellent for meal prep, as they keep well in the fridge for up to 5 days.Refrigerator: Transfer the onion to an airtight container, such as a mason jar, cover it with the marinating liquid, and refrigerate for 5 days.Freezer: We don’t recommend freezing this recipe.ALSO ON THIS PAGE