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["Line bottom of a shallow baking pan with parchment or wax paper.", "Bring sugar, water, and salt to a boil in a 12"" heavy skillet, stirring until sugar is dissolved.", "Reduce heat and simmer syrup 2 minutes.", "Put nuts in a large heatproof bowl, then add syrup and toss with a wooden spoon until nuts are coated and sugar begins to crystallize, about 3 minutes.", "Return nuts to skillet and cook over moderate heat, stirring constantly, until sugar coating is golden and no longer crystallized, 5-8 minutes.", "Remove from heat and stir in butter.", "Spread nuts in 1 layer in baking pan and cool to room temperature, about 20 minutes.", "When nuts are cool, transfer to a bowl, reserving baking pan with parchment.", "Heat half of chocolate in a microwave-safe dish in microwave at 50% power until melted, checking frequently after 2 minutes.", "Add remaining chopped chocolate to melted chocolate and stir until smooth, then pour over nuts and let stand, stirring occasionally, until chocolate is almost set, 20-25 minutes.", "Sift 2 T cocoa powder over nuts and toss to coat.", "Return nuts to parchment-lined baking pan, separating nuts with your hands, and let stand until chocolate is completely set, about 30 minutes more.", "Toss nuts with remaining tablespoon cocoa powder."]