BUTTER-ROASTED HALIBUT WITH ASPARAGUS AND OLIVES

Butter-Roasted Halibut with Asparagus and Olives image

Provided by Alison Roman

Yield 6-8 servings

Number Of Ingredients 12

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2 bunches asparagus, trimmed, halved lengthwise if thick, divided
6 Tbsp. unsalted butter
7 Tbsp. extra-virgin olive oil, divided
1 tsp. Aleppo-style pepper
2 1/2 lb. skinless halibut, salmon, or arctic char fillet
Kosher salt, freshly ground pepper
2 bunches ramps or scallions, trimmed
3/4 cup Castelvetrano olives, pitted, torn
1/4 cup finely chopped chives
1/4 cup fresh lemon juice
2 Tbsp. coarsely chopped tarragon, plus leaves for serving
Boiled small waxy potatoes and lemon wedges (for serving)

Steps:

Preheat oven to 325°F. Thinly slice one-quarter of asparagus into coins and place in a medium bowl; set aside.
Heat butter and 2 Tbsp. oil in a small saucepan over medium. As soon as butter is melted, add Aleppo-style pepper and remove from heat.
Season fish with salt and black pepper on both sides and place on a rimmed baking sheet. Scatter ramps and remaining asparagus around fish; season with salt and black pepper. Pour butter mixture over fish and vegetables. Give vegetables a toss to evenly coat. Roast, undisturbed, until fish is just opaque in the center and asparagus is bright green and tender, 15-25 minutes, depending on the thickness of your fillets.
Toss olives, chives, lemon juice, 2 Tbsp. tarragon, and remaining 5 Tbsp. oil with reserved asparagus; season with salt and black pepper.
Transfer fish to a platter; top with ramps and asparagus. Spoon some olive mixture over, then scatter tarragon leaves over. Serve with potatoes, lemon wedges, and remaining olive mixture alongside.