Eggless Hojicha Tiramisu Cake is a Japanese twist on the classic Italian dessert. It consists of hojicha soaked ladyfingers layered with airy mascarpone cream and finished with a generous dusting of hojicha powder.
In a small bowl, combine the sugar and hojicha. Add a little bit of hot water and stir vigorously until well combined with no lump. Add the remaining hot water and stir to combine.
Let the mixture cool slightly. Stir in the rum.
Mascarpone Cream
In a large bowl using a handheld or stand mixer fitted with a whisk attachment, beat the heavy whipping cream, confectioners' sugar, and vanilla extract on high speed until stiff peaks form. Set aside.
In a large bowl, soften the mascarpone cheese. Add a third of the whipped cream and mix until well incorporated and looks lump-free. Add the remaining whipped cream and whip on high speed until stiff peak. Refrigerate the frosting until using it.
Trim the ladyfingers to fit the pan (I use 8 ladyfingers for each layer).
One at a time, gently dip both sides of ladyfingers into the hojicha simple syrup, then place on the bottom of the pan. Top with about one-third the mascarpone cream, spread into an even layer. Repeat the process for the second and third layers.
Chill for at least 6 hours or overnight to set.
Remove the mold and baking paper or cake side membrane.
Pipe whipped cream on top if desired.
Dust the top with hojicha powder just before serving.