- 4 bunches of beets with tops or 2 pounds medium beets
- 1/2 bunch Swiss chard, ribs and stems removed, leaves torn into large pieces
- 5 tablespoons olive oil, divided
- Kosher salt, freshly ground pepper
- 1/2 bunch marjoram or oregano, plus 2 tablespoons leaves
- 1/2 cup crème fraîche
- 1/2 cup plain whole-milk Greek yogurt
- 1 teaspoon plus 1 tablespoon Sherry vinegar or red wine vinegar
- 2 tablespoons toasted sesame seeds
- Preheat oven to 400°. Trim tops from beets; set aside half of tops (reserve remainder for another use). Scrub beets, pat dry, and slice 1/4″ thick. Toss in a large bowl with 4 tablespoons oil; season with salt and pepper. Scatter marjoram sprigs across a rimmed baking sheet and arrange beets on top in as even a layer as possible (some overlap is okay). Roast, tossing occasionally, until beets are tender, 15–20 minutes. Remove from oven and toss in reserved beet greens; roast just until slightly wilted, about 2 minutes. Let cool.
- Scatter marjoram sprigs across a rimmed baking sheet and arrange beets on top in as even a layer as possible (some overlap is okay). Roast, tossing occasionally, until beets are tender, 15–20 minutes. Remove from oven and toss in reserved beet greens; roast just until slightly wilted, about 2 minutes. Let cool.
- Meanwhile, whisk crème fraîche, yogurt, and 1 teaspoon vinegar in a small bowl; season with salt; set aside.
- Smash sesame seeds, 2 tablespoons marjoram leaves, and a generous pinch of salt in a mortar and pestle to combine. (Alternatively, chop with a knife.) Transfer to a small bowl and mix in remaining 1 tablespoon oil; set sesame salt aside.
- Drizzle roasted beets and greens with remaining 1 tablespoon vinegar; season with salt and pepper. Spoon reserved crème fraîche mixture between 2 platters and arrange beets and greens on top; sprinkle with sesame salt.
- Do ahead: Beets (without greens) can be roasted 1 day ahead. Let cool; cover and chill. Bring to room temperature before using; sauté greens separately. Sesame salt can be made 2 days ahead; cover and chill.