The foil packet has convinced home grillers that they're preventing disaster when they're actually preventing flavor. Wrapping fish eliminates the possibility of sticky skin while simultaneously eliminating the possibility of delicious skin—the most textured, flavorful part of the fish. Restaurant cooks grill fish skin-side down directly on grates, achieving burnished, crispy results that foil makes impossible. The Oil-and-Heat Formula The secret isn't foil avoidance; it's oil application and temperature management. Pat your fish (skin-on fillets only; skinless fillets genuinely need foil) completely dry. Coat the skin with a thin layer of high-smoke-point oil—grapeseed, avocado, or clarified butter work identically. Preheat your grill to high (450°F+), place fish skin-side down directly on well-oiled grates, and do not touch it for 4 minutes. This initial sear creates the crispy texture. Flip once, cook another 3 minutes flesh-side down, and finish. The skin should shatter under your fork, not bend. "The magic happens in stillness," says Dave Pickering, head chef of Oceanside Seafood Company in Portland. "People panic and flip fish constantly. Let it sit. The oil and heat bond the protein to the grate, and that's where flavor lives." Start with thicker fish: salmon, halibut, or branzino. Thinner fillets still demand respect, but they're unforgiving.