Combine the fish stock, shallots, and garlic in a small saucepan and simmer until content is reduced to about 2/3 cup.
Put the sorrel leaves into the bowl of a food processor and run for about 30 seconds. While it's running, add olive oil and salt and pepper.
Keep warm until the salmon is done.
Season the salmon with salt and pepper then Bake at 450 degrees Farenheit for 10 to 12 minutes.
Pour the sorrel sauce on a plate. Place the cooked salmon on top.