Use a sharp knife to make 3 slashes on each side of the fish, cutting through the skin and flesh to the bone. Arrange the sardines on a baking sheet.
Mix together all the remaining ingredients, season to taste then rub all over the fish to coat thoroughly.
Cook the sardines under a preheated hot grill or on a barbecue, turning once, for 3–5 minutes or until cooked through. Serve with toasted ciabatta, a crisp green salad and lemon wedges.