Greek Lemon and Chicken Soup (Avgolemono)

Heat oil in a large soup pot over medium-low heat. Add carrot, onion, and celery. Cook, stirring continuously, until vegetables start to soften and turn translucent, 5 to 10 minutes. Stir in garlic and cook until fragrant, about 1 minute.

Add chicken broth, parsley, and oregano. Increase heat to medium-high and bring to a boil. Add chicken and orzo. Reduce heat to a simmer.

Meanwhile, whisk eggs in a heat-safe bowl or glass measuring cup. Add the lemon juice and whisk until well combined.

Slowly add a ladle of hot broth to the egg mixture, whisking quickly to avoid scrambling the eggs. Repeat with a few more ladles until the egg mixture is hot and steaming. Slowly pour the egg mixture into the saucepan and whisk until incorporated.

Add 1/2 of the lemon zest to the soup; reserve remaining zest for another use. Taste soup; if too lemony, add chicken bouillon. Add hot pepper sauce, salt, and pepper. Cook until orzo is tender yet firm to the bite, about 5 more minutes. Serve immediately.