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Preheat the oven to 350°F. Lightly grease three 8" round cake pans; line the bottoms with parchment, for easiest release.
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To make the spice cake: Whisk together the first eight ingredients (flour through allspice); set aside.
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Combine the egg yolks and oil. Mixing at low speed, add the sugar.
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Add the water and boiled cider. Beat on medium speed for 3 minutes, scraping the bottom and sides of the bowl a couple of times.
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Fold in the dry ingredients.
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In a separate bowl, beat the egg whites until foamy. Add the cream of tartar and beat until soft peaks form. Carefully fold the whites into the batter.
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Divide the batter among the three pans.
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Bake the cakes for 18 to 23 minutes, until a toothpick or pairing knife inserted into the center of one comes out clean.
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Remove the cakes from the oven, and cool in the pan for 10 minutes before turning out onto a rack to cool completely.
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To assemble the cake: Spread an even layer of frosting onto the top of one layer. Top with a second layer, and frost. Top with the final layer, and frost and decorate as desired; we suggest small sprigs of rosemary, fresh or dried cranberries, crystallized ginger, or candied orange slices for a festive look.
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Storage information: Store any leftover spice cake in an airtight container in the refrigerator for several days. Un-frosted cake layers can be wrapped and frozen for up to 1 month for longer storage.