1. Combine orange juice, maple syrup, and vinegar in glass measuring cup. Set aside.
2. Remove stems from collard leaves by holding a stem with 1 hand and ripping leaf off each stem with other hand. Stack 5 or 6 leaves at a time, roll up lengthwise, and cut into 1/4-inch-wide ribbons. Chop ribbons into 2- to 3-inch lengths. Set aside.
3. Heat 2 Tbs. oil in Dutch oven over medium heat. Add onions, and season with salt, if desired. Cover, and cook 6 to 7 minutes. Uncover, and cook 15 minutes more, or until onions are lightly golden. Add ginger, and cook 30 seconds. Add 7 cups water and salt, and bring to a boil. Reduce heat to medium-low, partially cover, and cook 15 minutes. Remove from heat.
4. Heat 1 Tbs. oil in large skillet over medium-high heat. Add potatoes, and season with salt, if desired. Cook 6 to 8 minutes, or until potatoes are well-browned on at least 2 sides, stirring occasionally. Transfer to bowl.
5. Add 1 Tbs. oil to same skillet. Add carrots, and cook 6 to 8 minutes, or until well-browned on at least 2 sides. Transfer to bowl with potatoes.
6. Add remaining 1 Tbs. oil to same skillet. Add rutabaga, and cook 6 to 8 minutes, or until well-browned on at least 2 sides, stirring occasionally. Transfer to bowl with potatoes.
7. Add vegetables to onion broth, and bring to a boil. Reduce heat to medium-low, and simmer 9 minutes, or until vegetables are tender. Add collard greens, and cook 5 minutes. Stir in 1 to 2 Tbs. of orange juice mixture.