Step 1

Peel and slice turnips. Heat 1 tablespoon oil and butter in a large saucepan over medium heat. Add onion and cook, stirring, until beginning to brown, about 5 minutes. Add the turnips, rosemary, 1/2 teaspoon salt and 1/4 teaspoon white pepper; stir to combine. Cover and cook, stirring once or twice, for 10 minutes.

Step 2

Add broth, increase heat to high and bring to a boil. Reduce heat to maintain a simmer, cover and cook until the turnips are tender, 10 to 12 minutes more.

Step 3

Meanwhile, toss the turnip greens (or spinach) in a medium bowl with carrot, scallion greens, vinegar, the remaining 1 tablespoon oil and pinch of salt and pepper.

Step 4

Puree the soup in the pan using an immersion blender or transfer to a regular blender and blend until smooth. (Use caution when pureeing hot liquids.) Serve each portion of soup topped with a generous 1/4 cup of the salad.