Rum-Scented Marble Cake

Marble cakes are both homey and festive. A marble cake looks slick when you slice into it and reveal the delicate pattern created when the two batters are swirled together. My first experience working with this type of mixture came about as the result of a marbled chocolate terrine that appeared first in the pages of the old Cook’s Magazine, and then in my chocolate book. Everything about it was right—the texture, the flavor, the quantity of mixture in relation to the mold—everything