Heat oil in a 6-quart pot and cook onion over medium heat for 5 minutes. Add garlic for 30 seconds, then potatoes, cabbage, broth, bay leaf, salt and pepper.
Bring to a simmer and cook for 12 to 15 minutes until potatoes are almost tender.
Add green beans and zucchini and simmer for 7 to 9 minutes until all vegetables are tender but still hold their shapes.
Add roast turkey and simmer gently for 5 to 8 minutes until the turkey reaches 165°F. Remove bay leaf.
Stir in vinegar and divide turkey, vegetables and broth evenly among 6 bowls.