Bittersweet Chocolate Mousse Cake with White-Chocolate Sauce

There is such a bewildering array of chocolate available in stores today that the only way to become educated about it, I concluded, is to try as many kinds as possible. I urge you to do likewise. You’ll find/that chocolate ranges in taste the way wine does. Some brands are smooth and subtle, while others are very intense, almost sharp. Some have a berry aroma; a few have coffee undertones. Invite a bunch of friends over for a chocolate tasting. Try to include Valrhona, Callebaut, Lindt, Gh