Begin by halving and then thinly slicing the red onion into half-moons.
Add onion, sumac, lemon juice, and extra virgin olive oil to a medium sized bowl. Mix thoroughly with your hand making sure all the onion slices are separated. Add salt to taste, a generous amount of salt will be needed here.
Nutrition: Please note that the nutritional information provided is an estimate based on an online nutrition calculator. Nutritional values will vary based on the specific ingredients you use, and readers are encouraged to make their own calculations.