Smoked Chile Collard Greens

In a large saucepan, heat oil until very hot, add onion and cook until soft. Add garlic and cook 1 minute, stirring. Add 1 1/2 cups water and chipotle. Heat to boiling. Stir in collards, salt and pepper. Turn greens to coat. Reduce heat to medium and cover pan. Cook 20 minutes or until greens are crisp-tender. Stir occasionally. Transfer greens to serving platter and drizzle with vinegar. Serve immediately.