Make hard-boiled eggs in your preferred way, and let them cool.
Slice the eggs and put them in a medium-sized bowl.
Season with salt, pepper, ½ teaspoon of sumac, and one teaspoon of Aleppo pepper. Drizzle 1 tablespoon of the extra virgin olive oil over it. Toss gently to combine these ingredients.
In a separate bowl, mix the sliced tomatoes, avocados and cucumbers. Mix in the chopped onions as well.
Season with salt, pepper, ½ teaspoon of sumac, and ½ teaspoon of Aleppo pepper. Add the lemon juice and remaining olive oil to it. Gently toss to combine.
Combine this mixture with the egg mixture and gently toss it together.