Chocolate-Filled Hazelnut Cookies

Ingredients

• ¼ teaspoon fresh lemon zest
• 8 tablespoons unsalted butter
• 1 cup confectioners sugar
• parchment paper
• ¾ cup hazelnuts
• ¹/₈ teaspoon salt
• 3 ounces fine-quality bittersweet chocolate (not unsweetened; preferably 70% cacao)
• + 1 more ingredients
• • 1 cup cake flour (not self-rising)

Put oven rack in middle position and preheat oven to 350°F. Line 2 or 3 baking sheets with parchment paper. Grind nuts with confectioners sugar in a food processor until powdery (be careful not to process to a paste). Beat together butter, zest, salt, and nut mixture in a large bowl with a rubber...

View full recipe at Epicurious