In medium pot, combine water, onion, bay leaf, allspice, garlic, Worcestershire sauce, tamari, cumin and honey. Bring to a boil, reduce heat and simmer 5 minutes. Add collard greens and return to a boil. Reduce heat and simmer, covered, until greens are tender, about 30 minutes.
Remove pot from heat; cool slightly. Remove bay leaf and stir in oil. Add salt, pepper and cayenne to taste. Serve hot.