1 1 / 2 lb (680 g) asparagus, woody ends trimmed 2 tbsp (30 ml) extra-virgin olive oil, plus 1 tsp (5 ml) for gremolata 1 / 2 tsp kosher salt 1 / 4 tsp freshly ground black pepper 1 / 3 cup (40 g) hazelnuts, toasted and coarsely chopped 1 small garlic clove, finely minced 1 tsp finely grated lemon zest 1 tbsp (15 ml) fresh lemon juice 2 tbsp (8 g) flat-leaf parsley, finely chopped Pinch red pepper flakes (optional)
Preheat oven to 425°F (220°C). Line a sheet pan with parchment for easy cleanup. Toss asparagus with 2 tablespoons olive oil, salt, and pepper. Spread in a single layer and roast 10–12 minutes until tender-crisp with slight browning at the tips. While asparagus roasts, combine hazelnuts, garlic, lemon zest, parsley, and red pepper flakes in a small bowl. Add lemon juice and 1 teaspoon olive oil; toss to form a loose gremolata. Transfer asparagus to a serving platter and spoon the lemon-hazelnut gremolata over the top. Serve immediately alongside the halibut.
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