Salted-Caramel Six-Layer Chocolate Cake
If you don't own a candy thermometer, this cake offers a good excuse to buy one. It sounds a little nitpicky, but the caramel should reach exactly 238 degrees. (Any less and the cake layers won't hold together properly; any more and the caramel will turn hard.) Precision will also pay off with the chocolate frosting—it achieves its ideal spreading texture after standing for 30 minutes.