Place salmon in two 6 inch square pans or two 8 inch mini loaf pans and pour half of the marinade over the salmon. Allow salmon to marinate for 30 minutes in the fridge.
Mix 1 tablespoon of cornstarch with 1 tablespoon of water and whisk to combine. Once the marinade comes to a simmer, slowly pour in the cornstarch slurry and whisk constantly until thickened, 1-2 minutes.