There is nothing like a little homemade decoration to dress up a store bought dessert. Invest in a squeeze bottle and look like a pro!
In the bowl of a food processor, place raspberries, sugar, lemon juice and zest. Blend until pureed. Place a fine-meshed strainer over a bowl. Pour the berry mixture through the strainer to remove the seeds, pressing down with a spoon to force the fruit and juices through. Transfer to a covered non-reactive container and refrigerate until ready to serve. The puree will keep well for several days.