Olive Garden Lemon Cream Cake

Name: Olive Garden Lemon Cream Cake
Prep time: 1 h
Cook time: 2 h
Total time: 3 h
Cuisine: American
Ingredients: 3/4 cup whole milk; 6 egg whites; 1 teaspoon vanilla extract; 1/4 teaspoon lemon extract; 6 ounces unsalted butter (softened); 1 1/2 cups sugar; 2 cups self-rising flour (sifted); 1/4 teaspoon kosher salt; 2 teaspoons lemon zest; 8 ounces mascarpone cheese; 1 cup heavy whipping cream; 2 cups powdered sugar (sifted); 1 1/2 teaspoons lemon zest; 1/4 teaspoon kosher salt; 1/4 teaspoon lemon extract; 1 1/2 tablespoons freshly squeezed lemon juice; 1/3 cup limoncello; 3/4 cup all-purpose flour; 3/4 cup powdered sugar; 3 ounces cold butter; 1/4 teaspoon kosher salt; 1/2 teaspoon lemon zest; 1/4 cup powdered sugar