Shakshuka

In a large cast-iron or other heavy skillet, heat oil over medium heat. Add onion; cook and stir until tender, 4-6 minutes. Add garlic, seasonings and, if desired, chili sauce; cook 30 seconds longer. Add tomatoes; cook until mixture is thickened, stirring occasionally, 3-5 minutes., With back of spoon, make 4 wells in vegetable mixture; break an egg into each well. Cook, covered, until egg whites are completely set and yolks begin to thicken but are not hard, 4-6 minutes. Sprinkle with cilantro; serve with pita bread.