Ingredients

• 1 garlic clove, finely grated
• 1/4 cup tahini
• 2 tablespoons fresh lemon juice
• 2 tablespoons olive oil
• Kosher salt
• 3 tablespoons olive oil, divided
• 1 small head cauliflower, cored, cut into large florets
• 1 tablespoon fresh lemon juice
• Kosher salt
• 2 tablespoons raw pumpkin seeds
• 2 teaspoons sesame seeds
• 1 teaspoon nigella seeds
• 2 whole small Spanish mackerel (about 1 pound each), cleaned
• 1 tablespoon olive oil
• Kosher salt
• 1 lemon, thinly sliced, seeds removed
• 1 bunch thyme
• 1/2 cup pomegranate seeds
• 1/2 cup fresh cilantro leaves with tender stems
• Nigella seeds are available at Indian markets or online. Tahini sauce Stir garlic, tahini, lemon juice, oil, and 1/4 cup water in a small bowl; season with salt.

Instructions

1. Heat 2 tablespoons oil in a large heavy skillet over mediumhigh. Working in batches if needed, cook cauliflower, tossing occasionally, until florets are browned in spots but still crunchy, about 5 minutes. Transfer to a large bowl and let cool. Reserve skillet.
2. Working in 2 batches, pulse cauliflower in a food processor until the size of rice grains. Transfer back to bowl, toss with lemon juice, and season with salt.
3. Cook pumpkin seeds and remaining 1 tablespoon oil in reserved skillet over medium heat, stirring, until seeds are golden brown, about 1 minute. Season with salt. Toss in a small bowl with sesame and nigella seeds.
4. Mackerel and assembly: Heat broiler. Place fish on a rimmed baking sheet and rub with oil; season all over with salt. Stuff cavity with lemon and thyme. Broil, turning once, until cooked through, 10–12 minutes. Let rest 5 minutes. Spoon cauliflower onto plates; drizzle with tahini sauce. Top with seed mixture and pomegranate seeds. Remove fillets from fish and place, skin side up, on top. Add cilantro and a sprinkle of salt.
5. Heat broiler. Place fish on a rimmed baking sheet and rub with oil; season all over with salt. Stuff cavity with lemon and thyme. Broil, turning once, until cooked through, 10–12 minutes. Let rest 5 minutes.
6. Spoon cauliflower onto plates; drizzle with tahini sauce. Top with seed mixture and pomegranate seeds. Remove fillets from fish and place, skin side up, on top. Add cilantro and a sprinkle of salt.