01 - 
                For fresh raspberries: Blend until smooth and strain through a fine mesh sieve to remove seeds, yielding about 2 tbsp puree. For freeze-dried raspberries: Process into a fine powder using a food processor or spice grinder.
              
              
              
                02 - 
                Chop the white chocolate and place in a heatproof bowl. Heat heavy cream until just simmering, pour over chocolate, let sit 2-3 minutes. Stir gently until smooth. Mix in raspberry puree or powder and butter (if using) until incorporated.
              
              
              
                03 - 
                Cover the bowl with plastic wrap and refrigerate for 2-3 hours or until ganache is firm enough to scoop.
              
              
              
                04 - 
                Use a small cookie scoop or teaspoon to portion ganache. Roll each portion between palms to form smooth balls.
              
              
              
                05 - 
                Roll truffles in desired coating: powdered sugar, cocoa powder, or melted white chocolate. Place coated truffles on a parchment-lined tray.