Preheat the oven to 325F.
Place the entire salmon fillet on a lined baking sheet. Coat generously with salt and pepper.
Roast the salmon at 325F for 15-16 minutes or until the internal temperature reaches 135F.
While the salmon is roasting, prepare the citrus sauce.
Cut the oranges in half and reserve 1 half for later. Add the orange juice to a large bowl, along with the juice from the lime, the finely grated garlic and ginger, the soy sauce, fish sauce, sriracha and sesame oil. Whisk to combine.
Let the sauce sit to develop in flavor.
Slice the remaining half of the orange into thin slices. Layer four orange slices in the bowl holding the citrus marinade.
Remove the salmon from the oven. Use a fork to flake the salmon away from the skin in big chunks.
Evenly layer the salmon pieces on top of the orange slices in the citrus broth. Essentially you are easing the salmon into the broth, coating it but also letting it rest on top.
Top the salmon with scallions, sesame seeds and any remaining orange slices as a garnish. Serve immediately!