Instructions

1. For the cake: Preheat the oven to 350°F. In a large mixing bowl, combine the sugar, vegetable oil, eggs and lemon extract. Beat on medium speed until the eggs and oil are well incorporated and the batter is lighter in color, about 2 minutes. Scrape down the bowl as needed.
2. Next, add the lemon zest and the sour cream and beat until well combined.
3. Combine the dry ingredients in a separate bowl. Add half the dry ingredients followed by the lemon juice and half the buttermilk and mix just until the flour starts to incorporate.
4. Finally add the remaining dry ingredients and buttermilk and beat until all of the ingredients are well combined. Use a spatula to scrape down the sides of the bowl and stir the batter from the bottom to the top to ensure it’s well mixed.
5. Pour the batter into a 9×13-inch pan and bake at 350°F for 28-32 minutes. Test the cake for doneness by inserting a toothpick into the center of the cake. If the toothpick comes out clean, your cake is done. Remove from the oven and allow to cool completely.
6. For the blueberry sauce: Start by rinsing the berries. In a medium-sized sauce pan, combine blueberries, sugar, flour and water; stir well. Cook over medium-high heat until mixture starts to bubble, stirring often. Turn down heat and let simmer to allow the blueberries to soften. Cook until sauce thickens; around 10-15 minutes. Stir often so the bottom does not burn. Allow to cool for 20 minutes, refrigerate if necessary.
7. While the cake is still warm, take the end of a wooden spoon or another round object and poke holes all over the top of your cake. Allow to cool for another 20 minutes.
8. For the pudding filling: by combining lemon pudding with milk and whisk until the pudding is dissolved. Pour pudding over top of cake, filling the holes. Refrigerate at least 10 minutes until the pudding is firm.
9. Pour blueberry sauce over top of the pudding and refrigerate until cake and toppings are cooled.
10. For the frosting: Place the mixing bowl and whisk attachment in the freezer for 5 to 10 minutes to chill.
11. Pour the heavy whipping cream into the chilled bowl and use an electric mixer to beat the heavy cream on medium-high speed until the cream starts to thicken. Slowly add the powdered sugar, vanilla extract and lemon zest and continue beating on high speed until soft peaks form.
12. Next, spoon the mascarpone into the bowl and continue beating at a high speed until stiff peaks form. Spread over top of cake, be sure the cake is completely cooled before spreading the whipped cream on top.