For her 100th cookbook, Martha: The Cookbook, icon Martha Stewart pulled together her most treasured recipes, such as this rum butter Bundt cake. A decadent rum butter glaze tops this rum cake, which is a rich mix of vanilla and buttermilk. "The texture of this cake is like a fine French pound cake, a quatre quart, but the flavor is quite different," writes Stewart, "and the glaze is a game-changer."