Preparation Center an oven rack and preheat the oven to 375°F. To make the cake, melt the butter in a large saucepan over medium heat. Whisk in the cocoa. Add the oil and water and bring to a rolling boil for 30 seconds. Remove the pan from the heat and set it aside to cool slightly. Meanwhile, sift together the flour, sugar, baking soda, and salt in a large bowl, then whisk the ingredients by hand to ensure they are well mixed. Pour the warm cocoa mixture into the sifted ingredients and whisk until just combined. In a small bowl, whisk together the eggs, buttermilk, and vanilla. With a rubber spatula, stir the buttermilk mixture into the batter. Pour the batter into the greased pan and place in the center of the oven. Bake until the top is firm and a wooden skewer inserted in the middle of the cake comes out with moist crumbs, 32 to 35 minutes. While the cake is in the oven, make the frosting: melt the butter in a saucepan over medium heat. Whisk in the cocoa and bring the mixture to a rolling boil; boil for 30 seconds. Remove from heat and whisk in the milk and vanilla. Add the confectioners' sugar 1 cup at a time while whisking continuously. Immediately after the cake comes out of the oven, pour the frosting over the hot cake and sprinkle with the nuts. Try not to jiggle the cake before it sets or you'll leave waves in the frosting. Allow to cool before cutting into squares. Well wrapped and stored at room temperature, this cake keeps for up to 5 days. Reprinted with permission from Vintage Cakes: Timeless Recipes for Cupcakes, Flips, Rolls, Layer, Angel, Bundt, Chiffon, and Icebox Cakes for Today's Sweet Tooth by Julie Richardson. Copyright © 2012 by Julie Richardson; photographs copyright © 2012 by Erin Kunkel. Published by Ten Speed Press, an imprint of the Crown Publishing Group, a division of Random House, Inc. All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.Julie Richardson is the owner and head baker of Baker & Spice, a small-batch bakery and café in Portland, Oregon. She is a graduate of the Culinary Institute of America in Hyde Park, New York, and the coauthor of Rustic Fruit Desserts. Her sweet tooth led her to open her first bakery, Good Earth, in Ketchum, Idaho. Upon moving to Portland, she fell in love with the farms and fruits of the Pacific Northwest and launched Baker & Spice from a stall at the farmers' market in 1999. Julie spends most days baking cakes, croissants, and pies or teaching classes at SweetWares, her retail bakeware shop. When Julie is not baking, she can be found digging in her garden. She lives in Portland with her husband, Matt, and their many four-legged friends.