Day Ahead Prep: In a small container, pour rum over the raisins and leave to soak overnight. You may want to make the Maple Cream Cheese Frosting a day ahead too. It is more stiff after being refrigerated, making it easier to frost the cake.
Day of: Preheat oven to 350 degrees. Line 2 round cake pans with parchment circle on the bottom, then grease bottoms and sides of pans.
In a medium bowl, combine the flour, salt, baking soda and baking powder, cinnamon, nutmeg and ginger. Stir so that it is all combined well and set aside.
Separate eggs. Whip the egg whites to stiff peaks using a mixer at high speed. Set aside.
In a large bowl, using a stand mixer or hand mixer, beat the sugar and butter until combined and creamy. Add egg yolks, then yogurt and vanilla. Then add the raisins and the rum. Next the carrots and finally the chopped nuts. Making sure to combine ingredients well after each is added.
On a slow speed, gradually add the flour mixture a little at a time until it is all combined well.
By hand, fold in the whipped egg whites until just barely combined. Then pour half of the mixture into each prepared baking pan.
Bake for 50-55 minutes, until the center is set. There should still be a slight crumb or some moisture if you insert a toothpick, you don’t want it to get completely dry. Begin checking for doneness every 5 minutes after the 45 minute mark.
Once the cakes are out of the oven, let them cool completely. Trim the tops so that they are level. Then put the frosting on (instructions below) and decorate the sides with more crushed walnuts or pecans.