This is fruitcake reinvented: Meringue mushrooms sprout from the cake's surface, which is untraditionally covered with snowy white frosting.
Preheat oven to 300 degrees. Coat a 10-inch springform pan with cooking spray. Line bottom with parchment paper, and spray parchment; set pan aside. In a medium bowl, toss apricots, figs, and dates with liqueur; set aside. In another bowl, whisk together flour, baking powder, and salt, and set aside.
In the bowl of an electric mixer fitted with the paddle attachemnet, cream together butter and sugars on medium speed until light and fluffy. Add the eggs one at a time, beating after each until incorporated. Beat in honey and vanilla. Add flour mixture, and beat until mixture is just combined. Stir in dried fruit mixture and hazelnuts.
Spread the batter in prepared pan, and bake until a cake tester inserted in center comes our clean, about 1 1/4 hours; if cake starts to brown too quickly, cover loosely with foil. Remove cake from oven; transfer to a wire rack, and let cool in pan 30 minutes. Remove ring from cake, and let cool completely.
Spread frosting over cake, smooting top and creating swirls on side. Decorate top with meringue mushrooms.