Pasta and greens make a marvelous combination – a tasty and nutritious change of pace from the usual tomato sauce. The feta cheese adds just the right tang. You can make this year-round, with summer greens, such as spinach and Swiss chard, or winter greens, such as kale and escarole.
In a large Dutch oven, heat the oil over medium heat. Add the onions and saute until golden, about 10 minutes. Meanwhile, begin heating the water for the pasta. Add the chopped greens to the Dutch oven and stir until the greens begin to wilt. Cover and cook over medium-low heat for 10 to 15 minutes.
Cook the pasta according to the package directions. Drain, adding a few tablespoons of the cooking water to the greens. Reduce the heat under the greens to low. Add the cheese. Then add the pasta to the greens and mix thoroughly. Add the Parmesan cheese and salt and pepper to taste.