- 1/2 cup hazelnuts
- 4 (6-ounces) pieces hake fillet
- 2 tablespoons extra-virgin olive oil
- 2 tablespoons unsalted butter
- 1 garlic clove, finely chopped
- 2 tablespoons red-wine vinegar
- 2 tablespoons water
- 2 tablespoons drained bottled small (nonpareil) capers
- 1/4 cup chopped flat-leaf parsley
- Pulse hazelnuts in food processor until finely chopped.
- Pat fish dry and season with 1/2 teaspoon salt and 1/4 teaspoon pepper. Heat oil in a large heavy skillet over medium-high heat until it shimmers. Sauté fish, turning once, until golden and just cooked through, about 8 minutes total. Transfer to a platter.
- Melt butter in skillet, then sauté hazelnuts with garlic until nuts are golden brown, 1 to 2 minutes. Add vinegar and water, scraping up any brown bits, then remove from heat and stir in capers and parsley. Season with salt and pepper, then spoon over fish.