Step 1

Bring the chicken broth to a boil in a medium saucepan over medium-high heat. Add the orzo and cook 2 minutes less than the label directs.

Step 2

Meanwhile, whisk the egg, yolks, 3/4 teaspoon salt and 1/4 teaspoon pepper in a medium bowl. Whisk in the lemon juice. Reduce the heat under the orzo to low; scoop out 1 cup broth with a ladle and pour it into the egg mixture in a steady stream, whisking with the other hand. Then pour the egg mixture into the saucepan with the remaining broth and orzo in a steady stream, whisking constantly.

Step 3

Stir the chicken into the soup. Increase the heat to medium and bring to a gentle simmer, stirring often. Cook, stirring, until the soup thickens slightly, about 4 minutes. Stir in the peas and carrots and warm through.