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Place the dill, green onion, lemon juice, lemon zest, garlic and 1/2 tsp (2 ml) each salt and pepper in a food processor. Pulse until finely chopped. With the motor running, slowly pour in the oil until well combined. Divide the mixture in half. Stir one portion with the sour cream; set aside. Season the salmon with the remaining salt and pepper. Brush the remaining dill mixture over the salmon.
Turn the grill on. Select the program Fish and press OK . Lightly grease the cooking plates with cooking spray. Once the purple indicator light has stopped flashing, place the salmon on the grill and close the lid. Cook until the indicator light has changed to yellow.
Serve the salmon with the reserved sour cream mixture on the side.