
Whole roasted fish is one of those meals that looks impressive but comes together with surprisingly little effort, and this Mediterranean version delivers on every level. The combination of branzino, sea bass, or red snapper with extra-virgin olive oil, fresh herbs, garlic, and lemon hits nearly every note that makes this style of eating so powerful — omega-rich fish, polyphenol-packed olive oil, and aromatic herbs that do double duty as flavor and function. Zucchini and fennel roast right alongside the fish, soaking up the herby, citrusy drippings until they're tender and deeply savory. Stuffing the cavity with rosemary, thyme, lemon rounds, and garlic means every bite of the flesh is perfumed from the inside out. The high-heat roast crisps the skin beautifully while keeping the interior moist and flaky — no heavy sauces, no refined oils, nothing that works against you. It's the kind of dish that feels celebratory enough for a dinner party but clean and nourishing enough for a regular weeknight. A final squeeze of lemon and a scatter of fresh parsley over the platter is all it needs.
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Preheat the oven to 425°F (220°C). Toss the zucchini and fennel with 1 tbsp of the olive oil, the dried oregano, and a pinch of salt and pepper on a large rimmed baking sheet, then spread them into an even layer.
Pat the fish completely dry inside and out with paper towels. Using a sharp knife, cut 3 diagonal slashes about 1/2 inch deep through the thickest part of each fish on both sides — this helps the fish cook evenly and allows the seasoning to penetrate.
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