Chocolate-Covered Raspberry Truffles

Line a tray with wax paper. Bring cream just to a simmer in a 1- to 2-quart heavy saucepan over moderate heat. Remove from heat, then add chocolate and stir gently with a heatproof rubber spatula until ganache is smooth. Stir in framboise. Pat raspberries dry if necessary. Add 6 to 8 raspberries to ganache and gently fold in to coat using rubber spatula. Remove each chocolate-covered raspberry with 2 forks, shifting it from one fork to the other to let excess ganache drip off, then transfer to tray. Coat remaining raspberries in same manner, working in batches of 6 to 8. Chill truffles on tray until firm, at least 1 hour, then loosen from wax paper. Put cocoa in a sealable bag and add all of truffles. Seal bag, leaving some air in, and shake to coat. Empty bag into a shallow bowl. Transfer coated truffles to a platter with your fingers, shaking off excess cocoa. Keep chilled until ready to serve.