01 - Bring vegetable broth or water to a boil in a medium saucepan. Add orzo and cook according to package directions until al dente, stirring occasionally. Drain orzo, reserving 1/4 cup cooking liquid, and set aside.
02 - While the orzo cooks, place sun-dried tomatoes, olive oil, Parmesan, pine nuts, garlic, basil, lemon juice, salt, and pepper in a food processor or blender. Blend until mostly smooth but slightly chunky.
03 - Return drained orzo to the saucepan. Add pesto and reserved cooking liquid. Stir until orzo is thoroughly coated. For a creamier texture, fold in additional Parmesan and olive oil, if desired.
04 - Taste and adjust seasoning with additional salt and pepper as needed.
05 - Serve warm, garnished with chopped fresh parsley or basil and extra Parmesan.