Wash and peel mango. Remove flesh from mango; pieces do not need to be cubed or uniform in size. Place in blender or food processor and process until smooth. Add pineapple and process into small, pea-size chunks. Place mixture in a bowl, add cilantro, ginger, and pepper, and chill until served. (For even more flavor, grill the pineapple before adding to the mango puree.) Serve with warm or chilled salmon.