Ingredients

  • 1/3 cup extra-virgin olive oil plus more for brushing
  • 2 cups finely chopped onions
  • 2 cups chopped fennel
  • 2 garlic cloves, minced
  • Two 28-ounce cans Italian plum tomatoes, drained
  • Kosher salt and freshly ground pepper
  • 1/4 cup dry white wine
  • 1/4 cup chicken stock or canned low-sodium broth
  • 1/4 cup capers, drained and coarsely chopped
  • 1 cup coarsely chopped basil, plus small leaves for garnish
  • 2 tablespoons unsalted butter
  • 8 skinless halibut fillets (6 to 7 ounces each), about 1 inch thick

Method

  • In a large deep skillet, heat 1/3 cup of olive oil.
  • Add the onions and fennel and cook over moderately low heat, stirring occasionally, until softened, about 10 minutes.
  • Add the garlic and cook until fragrant, about 1 minute.
  • Add the tomatoes to the skillet and break them up with a fork.
  • Season with salt and pepper and cook over low heat until most of the liquid has evaporated, 15 to 20 minutes.
  • Add the wine, stock and capers and cook over low heat for 10 minutes.
  • Stir the chopped basil and the butter into the sauce.
  • Light a grill.
  • Brush the halibut fillets with olive oil and season generously with salt and pepper.
  • Grill over high heat until just cooked through, about 4 minutes per side.
  • Spoon the sauce onto a large deep platter, set the fillets on the sauce and garnish with basil leaves.
  • Serve hot or at room temperature.