BRING 4-1/2 cups water to boil. Dissolve strawberry, orange and 1 pkg. lemon gelatin mix each in 1-1/2 cups boiling water in separate bowls. Pour each flavor gelatin into separate 8-inch square pan. Refrigerate 40 min. or until firm. Cut into 1/2-inch cubes; refrigerate until ready to use.
BRING remaining water to boil. Add to remaining lemon gelatin mixes; stir until dissolved. Stir in evaporated milk. Pour into 12-cup fluted tube pan or gelatin mold sprayed with cooking spray. Refrigerate 30 min.
ADD gelatin cubes to gelatin in pan; stir gently. Refrigerate 2 hours or until firm. Unmold.