How to Make It
To prepare salsa, combine first 8 ingredients. Cover; refrigerate 30 minutes.
To prepare chicken, place each chicken breast half between 2 sheets of heavy-duty plastic wrap; pound to 1/2-inch thickness using a meat mallet or small heavy skillet. Combine pineapple juice and next 5 ingredients (through red pepper) in a large zip-top plastic bag. Add chicken to bag; seal. Marinate in refrigerator 30 minutes.
Remove chicken from bag, reserving marinade. Place chicken on a grill rack coated with cooking spray; grill 3 minutes on each side or until done.
Place reserved marinade in a small saucepan; bring to a boil. Reduce heat, and cook until reduced to 1/4 cup (about 5 minutes). Drizzle over chicken. Serve salsa with chicken.