Remove the frozen cake from the tin and slice into three layers, Line the tin with a long sheet of plastic wrap or parchment, so you can lift the chilled cake out later to frost it.
Put the first layer of cake, cut side up, back into the bottom of the tin. Drizzle 2-4 tablespoons of Kahlua onto the surface.
Spread the chocolate ice cream evenly over the surface. Put the next layer of cake on top and press down with even pressure to get it on nice and securely. Douse it with the Kahlua. Spread the coffee ice cream evenly over the cake.
Put on the final layer of cake, again cut side up, press down evenly, and drizzle with the Kahlua. Wrap the cake with plastic and put back in the freezer to harden, at least 2 hours or more.
In the meantime, whip the cream until stiff peaks form. Add the sugar and vanilla after the cream starts to thicken. Fold in the --- room temperature! --- mascarpone cheese. Keep folding gently until it is fully incorporated.
When the cake has fully hardened, remove it from the tin and place it on a plate or platter. Coat the top and sides of the cake liberally with the mascarpone cream frosting. Dust with lots of chocolate shavings.
Put back in the freezer, uncovered, until ready to serve. If you are keeping the cake for more than a couple of hours, let the frosting harden a bit, and then cover as best you can with plastic.
Serve straight from the freezer.
Notes
This can be done in any number of ways, alcoholic or not. I think it would be really fun with brightly colored ice cream and sprinkles, or maybe do one for the kids and one for the adults.
If you have a smelly freezer (I'm not judging) be sure you cover this with plastic if you intend to store it for any amount of time, or the cake will absorb the odors.
It's important that your mascarpone be at room temperature or it won't fold into the whipped cream. If yours is cold, zap it for 15 seconds or so in the microwave and stir well.
If you'd like to do a non-alcoholic Tiramisu, you can use coffee syrup in place of the Kahlua.
I forgot to add lots of chocolate shavings to each layer, but I would do that next time.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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