Wash the collard greens thoroughly to remove any dirt or grit. Stack several leaves at a time. Roll the leaves up, and slice into ¾ to 1-inch ribbons, keeping the center ribs intact. (See Tip 5)
Brown the smoked sausage: In a medium Dutch oven or heavy pot, cook the sliced smoked sausage over medium heat until lightly browned. Drain the sausage on paper towels. Set aside.
Pour the fat from the Dutch oven. Add the diced onion to the same pot and cook over medium heat until softened, about 4 to 5 minutes.
Add the chicken broth, scraping up browned bits from the bottom of the Dutch oven.
Add the collard greens in batches, stirring until they wilt enough to fit comfortably in the pot. Then, add the sugar, pepper, and cooked sausage.
Bring the greens to a gentle simmer. Cover and cook, stirring occasionally, for an hour or until desired tenderness. If the greens become too dry, add additional broth.
Stir in the vinegar and salt. Taste and adjust the salt level as needed.
Remove from heat and let the collard greens rest, covered, for 10 to 15 minutes before serving to allow the flavors to blend.
Yield: 4 servings. (See Tip 6)