The International White Truffle Fair is held from October to December. These chocolate raspberry truffles are the proper stability of creamy white chocolate, raspberry tang, and clean bittersweet chocolate. If a few of the chocolate will get eliminated, simply use the spatula to easy it over. Pour the new cream over the white chocolate and butter and let stand for 5 minutes. White Chocolate Ganache. In a big heatproof bowl, combine the white chocolate chips and butter. Pour the hot heavy cream over the white chocolate and butter in the bowl and let sit for five minutes.