- Place the salmon filets and Kikkoman® Black Pepper Sauce in a large ziplock back, making sure the sauce is fully coating the salmon. Marinate in the refrigerator for 30 minutes.
- When ready, position the oven rack on the middle shelf and preheat the oven to 400°F. Line a sheet pan with aluminum foil. Create a bed for each salmon filet to sit on by arranging the orange slices into 4 rows consisting of 3-4 slices in a single layer on top of aluminum foil.
- Remove salmon from marinade and wipe off excess sauce. Place each filet of salmon on top of a row of oranges on a sheet pan. Pour remaining sauce into a small saucepan and bring to a boil over medium heat. Simmer until thick and glossy, about 4-5 minutes. Remove from heat and set aside.
- Sprinkle salmon with salt then brush salmon with medium coating of boiled glaze. Bake for 10 minutes, adding a second coating of glaze halfway through.
- Remove salmon from the oven and switch the oven setting to broil. Brush a third coating of glaze onto salmon and return to the oven for 2-3 minutes, until the internal temperature reaches 125°F, making sure to keep an eye on the salmon as the glaze heats up quickly and it can burn easily.
- Remove salmon from the oven and glaze for a fourth time. Top with green onions and serve with remaining glaze on the side.