Saute 1 chopped onion and 1 thyme sprig in butter over medium heat until golden; season with salt. Increase the heat to medium high; add 1 cup orzo and toast 2 minutes. Add 2 cups chicken broth and bring to a simmer. Reduce the heat to medium low, cover and cook until the orzo is tender, 15 minutes. Stir in some chopped dill. Top with sour cream and paprika.