HEAT grill to medium heat. COMBINE apples, fresh fennel, parsley and raisins in medium bowl. Mix vinegar and oil until blended. Add to apple mixture; mix lightly. Refrigerate until ready to serve. MEANWHILE, grill sausage 10 min. or until done, turning occasionally. Transfer to cutting board; cut diagonally into 4 thin slices. MIX ground pork, peppers, Worcestershire sauce and fennel seed just until blended. Shape into 4 (1-inch-thick) patties. Grill 7 min. on each side or until done (160°F), adding buns, cut sides down, to grill to toast for the last minute. SPREAD cut sides of buns with mayo, then mustard. Place lettuce on bottom halves of buns; top with burgers, tomatoes and sausage. Cover with tops of buns. Serve with apple salad.