Thaw shrimp, if frozen; set aside. Preheat oven to 425°F. In a small saucepan, combine orange juice, coconut aminos, ginger, garlic, and, if desired, crushed red pepper. Bring to boiling; reduce heat. Boil gently, uncovered, for 15 to 20 minutes or until mixture is reduced to about 1/3 cup, stirring occasionally. Remove from the heat.