- 3 tablespoons pine nuts
- 4 medium white or Chioggia (candy-stripe) beets (about 1 pound)
- 1 tablespoon olive oil
- Kosher salt
- 2 tablespoons white wine vinegar
- 2 white grapefruits
- 3/4 cup plain Greek yogurt
- 1/4 cup fresh tarragon leaves
- Preheat oven to 350°F. Toast pine nuts on a rimmed baking sheet, tossing occasionally, until golden brown, 6–8 minutes; let cool.
- Increase oven heat to 400°F. Place beets on a sheet of parchment paper set on top of a sheet of foil; rub beets with oil and season with salt. Close up parchment and foil around beets. Place packet on a baking sheet and roast beets until tender, 40–50 minutes. Unwrap beets and let cool.
- Peel beets and thinly slice into rounds. Toss beets and vinegar in a medium bowl; season with salt and let stand 15 minutes.
- Meanwhile, finely grate 1/2 teaspoon zest from 1 grapefruit and set aside. Using a sharp, small knife, cut all peel and white pith from both grapefruits; discard. Thinly slice grapefruit into rounds.
- Place yogurt in a small bowl; season with salt and mix well. Spoon onto plates. Top yogurt with beets and sliced grapefruit, then tarragon, toasted pine nuts, and reserved grapefruit zest.
- DO AHEAD: Beets can be roasted 2 days ahead; let cool. Cover and chill. Pine nuts can be toasted 1 day ahead; store airtight at room temperature.