Lemony Pesto Chicken Soup

In a saucepan, bring stock to a simmer. Add orzo and cook 1 minute less than per package instructions. Add chicken and heat through, about 1 minute. Remove from heat. Stir in lemon juice. Divide among bowls. Add 1 tablespoon pesto to each. Serve with lemon wedges, grated Parmesan, pea shoots or other delicate greens, and fresh basil.