01 - Combine raspberries, sugar, and lemon juice in small saucepan. Cook over medium heat, stirring constantly, until raspberries break down and mixture thickens, about 5-7 minutes. Press through fine-mesh sieve to remove seeds. Allow to cool completely before proceeding.
02 - Place white chocolate, heavy cream, and butter in heatproof bowl. Set over pot of simmering water, creating double boiler. Stir continuously until melted and completely smooth. Remove from heat source.
03 - Whisk vanilla extract and 2 tablespoons cooled raspberry reduction into chocolate mixture. Reserve remaining raspberry sauce for another use. Ensure thorough incorporation.
04 - Cover mixture and refrigerate 1-2 hours until firm enough to scoop. Texture should hold shape when handled.
05 - Line baking sheet with parchment paper. Scoop 1-tablespoon portions of chilled ganache and roll into smooth balls. Place on prepared sheet. Freeze 30 minutes to firm.
06 - Melt coating white chocolate. Using fork, dip each truffle in melted chocolate, allowing excess to drip off. Return to parchment paper. Sprinkle crushed freeze-dried raspberries on tops while chocolate remains wet.
07 - Refrigerate truffles until chocolate is completely set, approximately 20 minutes. Store in airtight container in refrigerator.