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1
Preheat the oven to 500 degrees F. Put a baking sheet on the rack in the center of the oven and close the door.
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2
Drizzle both sides of the fish with olive oil and season the inside and outside with salt.
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3
Stuff the cavity with the lemon slices and the leftover fennel stalks and fronds.
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4
Open the oven door and carry the fish over squarely in both of your hands.
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5
Put the fish in the center of the hot sheet pan and quickly close the door so minimal heat escapes.
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6
You should hear the fish sizzle slightly as it hits the hot sheet pan.
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7
Reduce the heat to 450 degrees F and cook for about 20 to 25 minutes, then open the door to look at the fish.
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8
The eyes will turn white when it s cooked.
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9
Touch the fish near the head.
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10
It should feel fairly firm, if cooked.
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11
Remove the sheet pan from the oven and allow it to rest a few minutes as is.
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12
Use 2 spatulas, 1 under the head and the other under the midsection, to transfer the fish to a serving platter.
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13
Use a paring knife to gently cut around the head and the tail.
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14
Cut down the length of the back until you can insert 1 of your spatulas down the length of the top fillet and lift it off the bone.
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15
Then, lift the head and the full backbone off the fish, unveiling the second fillet.
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16
Season the fish with a pinch of salt and lemon juice.
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17
Serve with lemon slices.