The rich flavors in this moist cake intensify with a little bit of age. Though the Armagnac toffee sauce and Armagnac ice cream make festive partners, leftover cake is excellent served plain with tea or coffee.
To give extra height to the cake, we call for an 11-cup Kugelhopf pan, a taller-than-ordinary bundt pan (available by mail order from Bridge Kitchenware, tel. 800-274-3435 or 212-838-1901). You may also use a regular 11-cup bundt pan for a slightly broader cake.