
Tiramisu Tres Leches cake is the ultimate dessert mashup of Italian Tiramisu and Mexican Tres Leches cake!! Creamy mascarpone whipped cream slathered on a sponge cake that is soaked in espresso infused milk.
Separate the eggs while they’re still cold, placing the whites in a medium bowl and the yolks in a larger bowl. Cover both bowls and let them sit at room temperature for at least 30 minutes before you start preparing the cake.
Warm the milk on the stovetop or in the microwave—there's no need to bring it to a boil. Remove from heat, stir in the instant coffee, and let it cool to room temperature. Once cooled, mix in 3/4 cup of heavy cream, sweetened condensed milk, rum (if using), and vanilla extract.
Once the cake has cooled completely, use a toothpick or fork to poke holes all over the surface. This will allow the milk to penetrate the cake and make it exceptionally moist.
Add 2 cups heavy cream, confectioners sugar, mascarpone, vanilla extract and salt into a large bowl and continue to beat until it is thick and frosting consistency.