To prepare a white chocolate and raspberry tiramisu recipe, you will first need to prepare the ingredients. You will need: White chocolate: Melt the chocolate in the microwave in 30 second increments, stirring every 30 seconds, until melted and smooth. Add the sugar and beat the mixture with an electric mixer until it's light and fluffy, about 5 minutes. Gradually add the milk, beating well after each addition. If you don't have any sugar, use 2 tablespoons of white sugar. Raspberry: Place the raspberries into the blender and blend until they're finely chopped. Pour the whipped cream over the raspberry mixture and mix until the cream is completely incorporated. Refrigerate for at least 30 minutes before serving.