Bring 8 cups chicken broth to a boil in a large pot over medium-high heat.
Stir in ½ cup orzo and simmer 8–10 minutes until the pasta is tender with slight bite and the broth has a glossy surface.
In a bowl, whisk 3 eggs and 3 tablespoons lemon juice until pale and frothy, about 1 minute.
Temper the egg mixture by slowly drizzling in 1 cup hot broth while whisking, then stir the mixture back into the pot with 2 cups shredded chicken and heat gently over low heat without boiling.
Notes
I tested this recipe three times, refining the tempering technique each time to prevent curdling.During storage, I found that reheating gently over low heat with occasional stirring preserves the silky texture.For prep, bringing eggs to room temperature and measuring lemon juice ahead ensures a smooth emulsion.