1. Place sugar and 1/4 cup water in a small saucepan over high heat; stir, and bring to a boil. Reduce heat, and simmer until sugar is dissolved. Remove from heat, and allow syrup to cool completely. Place raspberries and syrup in the jar of a blender; puree until smooth. Pour through a fine sieve or colander into a bowl; discard solids. Serve or store in an airtight container, refrigerated, for up to 5 days.