2 large oranges
1/4 cup extra-virgin olive oil
1/4 cup fresh lemon juice
1/2 cup chopped fresh flat-leaf parsley
2 scallions, finely sliced
3 tablespoons chopped fresh mint leaves
2 tablespoons capers, rinsed, drained and coarsely chopped
2 tablespoons orange zest
1 teaspoon lemon zest
1 teaspoon crushed red pepper flakes
Kosher salt and freshly ground black pepper
Vegetable or canola oil, for oiling the grill
4 (4 to 5-ounce) center cut salmon fillets, skinned, each about 3-inches square
2 tablespoons amber agave nectar
Kosher salt and freshly ground black pepper