Preheat oven to 220°C/430°F (200°C fan). Line a tray with parchment/baking paper.
Trim fins: Cut all fins off the fish using scissors – both fins on the side, and the fins on the back and underside of the fish (but not the tail).
Slash flesh: Cut 3 slashes on each side of the fish, cutting through flesh down to the bone.
Stuff fish: Sprinkle a bit of salt and pepper inside the cavity of the fish. Scatter the cavity with garlic slices, then stuff with parsley and dill. Layer lemons on top of herbs.
Tie fish: Using kitchen string make 3 ties to hold fish together.
Season skin: Sprinkle remaining salt and pepper on the skin (both sides), including a bit on the head of the fish. Then drizzle with olive oil. Rub all over the fish, including in the slashes.
Bake 20 minutes: Place fish on prepared tray. Bake for 20 minutes or until the internal temperature is 55°C/131°F.
Rest: Remove from oven, transfer to serving platter and leave it to rest for 5 minutes.
Serve with Garlic & Dill Butter Sauce on the side.
