Chocolate truffle cake is a decadent and indulgent dessert that consists of a rich chocolate cake base that is layered and coated with smooth chocolate ganache or truffle frosting. The cake is often made with high-quality chocolate and has a dense, fudgy texture that melts in your mouth. chocolate truffle cake, bakers typically start by making a rich chocolate cake base, either from scratch or using a mix. They then prepare a chocolate ganache or truffle frosting by heating cream and pouring it over chopped chocolate until it melts, resulting in a smooth, creamy mixture. This ganache or frosting is then used to fill and frost the cake.