Tiramisu is neither a cake nor a pie in the traditional sense. It is a popular Italian dessert that is often referred to as a "cake," but it doesn't fit the typical characteristics of either a cake or a pie.
Tiramisu is a layered dessert made with ladyfinger biscuits (savoiardi) soaked in coffee or espresso and layered with a rich and creamy mixture of mascarpone cheese, eggs, sugar, and sometimes flavored with cocoa or liquor like Marsala wine or rum. It is then dusted with cocoa powder on top.
While tiramisu is commonly called a "cake," it lacks the structure and crumb of a typical cake. It doesn't rely on baking with rising agents like a cake does. On the other hand, it also doesn't have the crust or enclosed filling characteristic of a pie.
Due to its unique composition and preparation, tiramisu falls into the category of a dessert on its own, and its classification as a "cake" is more of a colloquial term. Some might even describe it as a chilled dessert or a custard-like dish because of its creamy, layered texture.
In summary, tiramisu is a delightful Italian dessert with a distinct taste and texture, but it doesn't neatly fit into the cake or pie category. It's a unique and delicious treat enjoyed by many around the world.