For the Rosehip Sauce: Reduce stock by about 1/3 to intensify flavor (watch saltiness if using canned stock) add remaining ingredients and cook down until the consistency of light syrup.
For the Smoked Oyster Potato Cakes: Combine all in ingredients for the oyster cakes in large mixing bowl by hand. With lightly floured hands, shape potato cakes. Brown on grill or saute with small amount of oil in skillet.
TO ASSEMBLE THE DISH: Brush salmon lightly with olive or canola oil and grill to desired doneness. Serve with Rosehip Sauce spooned over salmon with Oyster Potato Cakes along side.