1Heat gas or charcoal grill. In ungreased 11x7-inch (2-quart) glass baking dish, place salmon, skin sides down. Drizzle with 1/4 cup of the lemon juice.
2Remove salmon from baking dish; place skin sides down on grill over medium heat. Cover grill; cook 10 to 20 minutes or until salmon flakes easily with fork.
3In medium glass or plastic bowl, mix remaining 1/4 cup lemon juice and remaining ingredients. Serve nectarine salsa over salmon.