
Bold, warming spices like turmeric, ginger, smoked paprika, and cumin do all the heavy lifting here, creating a deeply savory crust on thick tuna steaks without a trace of cinnamon anywhere in the lineup. That matters more than you might think — spice blends and seasoning packets have a sneaky habit of tucking cinnamon in where you least expect it, so building your own rub from scratch puts you fully in control. The tuna goes onto a single sheet pan alongside blistered cherry tomatoes, tender green beans, and sliced garlic, all roasted together at high heat so everything finishes at once with minimal cleanup. The vegetables get a head start in the oven, which means by the time the tuna steaks join the pan, the tomatoes are already jammy and the beans have a little char on the edges. A squeeze of fresh lemon over the top at the end brightens the whole dish and plays beautifully against the earthy, smoky spice rub. It's a weeknight dinner that feels genuinely impressive — the kind of thing you'd order at a restaurant and then be thrilled to realize you made yourself.
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Position a rack in the upper third of the oven and preheat to 425°F (220°C). Line an 18×13-inch rimmed sheet pan with parchment paper or foil.
In a small bowl, combine the turmeric, ground ginger, smoked paprika, cumin, 1/2 tsp salt, 1/4 tsp black pepper, and cayenne, if using. Stir until evenly mixed.
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