Prepare the fish by removing the central bone. If your filleting skills are limited, ask your fishmonger to do it for you.
Put the 2 salmon fillets onto a board, fleshside up. Carefully remove any remaining bones with tweezers.
In a small bowl, beat together thesoftened butter, herbs, lemon zest, garlic,and plenty of pepper.
Spread the mixture over one of the salmon fillet,and put the other one on top.
Tie the fish together using kitchen string.Brush with olive oil. Sprinkle with salt and pepper.
Cook on a hot barbecue for 10-15 minutes on eachside.
Leave to rest for another 10 minutes, beforeremoving the sting.
Serve.