Ingredients10 cups fresh turnip or beet greens, or savoy spinach (about 2 bunches), bottom stems trimmed2 tablespoons kosher salt plus more for seasoning2 cups 1' cubes peeled butternut squash3 tablespoons extra-virgin olive oil, divided2 tablespoons vegetable oil4 ounces thinly sliced country ham or prosciutto, torn into pieces1 apple, such as Braeburn or Fuji, quartered, cored, thinly sliced2 tablespoons minced shallot2 tablespoons (or more) fresh lemon juice3 tablespoons buttermilkCoarsely...
