In a large pot, bring stock and turkey to a boil. Reduce heat to medium. Cook 20 minutes, or until turkey is done. Remove turkey. Reserve stock for soup. Let turkey cool 10 minutes; tear into strings.
In a covered bamboo steamer basket or a vegetable steamer basket over boiling water, steam the wrappers 5-7 minutes, or until wrappers are hot. Remove from basket.
Lay wrappers flat. Mound some turkey, some lettuce and some green onion in center of each wrapper. Fold bottom edge up, top edge down, and left and right sides over (work quickly so wrappers are still hot when served).
Mound Chinese mustard and sesame seeds in center of serving tray. Ring with Turkey Lumpia. In a small bowl, combine soy sauce and vinegar; pass with Lumpia.
Serve with steamed orintal rice and fresh seasonal fruit. Also good as an appetizer.