Ingredients

  • 1/2 stick unsalted butter, softened
  • 1/2 cup packed light brown sugar
  • 6 tablespoons all-purpose flour
  • 1/4 teaspoon pure vanilla extract
  • 1/8 teaspoon salt
  • 1/8 teaspoon curry powder
  • 1 large egg white
  • 2 ounces fine-quality bittersweet chocolate, chopped
  • 1/2 cup shelled roasted pistachios, chopped
  • Equipment: a small offset spatula

Method

  • Preheat oven to 350°F with rack in middle. Line a large baking sheet with parchment.
  • Blend butter, brown sugar, flour, vanilla, salt, curry powder, and egg white in a food processor until smooth.
  • Glue parchment down with a dab of batter in each corner, then spread remaining batter evenly into a 14- by 10-inch rectangle (1/8-inch-thick) on parchment with spatula. Scatter chocolate and nuts evenly over batter, then bake until firm and golden-brown, 18 to 20 minutes. Transfer, still on parchment, to a rack to cool completely. Remove from paper, breaking into pieces.