1/3 cup pine nuts (or walnuts)
4 tablespoons extra-virgin olive oil, divided
2 large onions, quartered lengthwise through root end, sliced crosswise (about 4 cups)
3 garlic cloves (or garlic scapes), minced
1 bunch beets with fresh healthy greens; beets scrubbed, greens cut into 1-inch-wide strips
12 ounces farfalle (bow-tie pasta)
1/3 cup grated Parmesan cheese plus additional for serving
Heat heavy large skillet over medium heat. Add nuts and stir until lightly toasted, about 3 minutes. Transfer to small bowl. Add 2 tablespoons oil and onions to same skillet and sauté until beginning to soften and turn golden, about 10 minutes. Reduce heat to medium-low and continue to sauté until onions are tender and browned, about 30 minutes longer. Add garlic and stir 2 minutes. Scatter beet greens over onions. Drizzle remaining 2 tablespoons oil over; cover and cook until beet greens are tender, about 5 minutes.
Meanwhile, cook beets in large pot of boiling salted water until tender. Remove beets from water with slotted spoon and slip skins off under cold running water. Slice beets into bite-sized pieces. Return the water to boil. Add pasta to beet cooking liquid and cook until tender but still firm to bite, stirring occasionally (pasta will be pink — if you don’t want pink pasta, boil pasta in fresh water!). Drain, reserving 1 cup pasta cooking liquid. Return pasta to pot.
Stir onion-greens mixture and beets into pasta. Add pasta cooking liquid by 1/4 cupfuls to moisten. Season with salt and coarsely ground black pepper. Stir in 1/3 cup Parmesan cheese. Divide pasta among shallow bowls. Sprinkle with pine nuts.