First, preheat your oven to 350F and grease the bottom and sides of your cake pan. Then, add a circle of parchment paper to the bottom of the pan, followed by more oil or spray.
In a large bowl, use your hands to massage the lemon zest into the sugar for several minutes. This releases the oils in the zest and helps impart a stronger lemon flavor.
1 cup cane sugar, 2 tbsp lemon zest
Then, add the eggs, EVOO, milk, lemon juice and vanilla to the bowl and whisk until smooth and combined.
3 large eggs, ¾ cup extra virgin olive oil, ½ cup milk of choice, ¼ cup fresh lemon juice, 1 tsp vanilla extract
Add in the remaining cake ingredients and stir with a spatula until the flour is just combined - do not overmix!
1.5 cups gluten free 1-to-1 flour, 1 cup finely ground pistachios, 1 tsp baking powder, ¼ tsp baking soda, ½ tsp kosher salt
Pour cake batter into prepared pan. Then, transfer it to the oven to bake for about 30 minutes. Let cool completely (about 2 hours) before adding the frosting.
Once the cake has cooled, add mascarpone and powdered sugar to a large bowl (or the bowl of a stand mixer) and beat until smooth and combined. Then, add in heavy cream and vanilla extract and beat again until stiff peaks form.
4 oz mascarpone cheese, ½ cup powdered sugar, pinch of kosher salt, ¾ cup heavy cream, splash of vanilla extract
Spread mascarpone whipped cream frosting evenly over the top of the cooled cake. Top with extra crushed pistachios and lemon slices. Enjoy!