01 - Preheat the oven to 350°F. Grease a 9-inch round cake pan and line the bottom with parchment paper.
02 - In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
03 - In a large mixing bowl, combine the granulated sugar and lemon zest. Rub together with your fingers until fragrant.
04 - Add the softened butter to the sugar mixture and beat until light and fluffy.
05 - Add the eggs, one at a time, beating well after each addition.
06 - Mix in the ricotta cheese, lemon juice, and vanilla extract until smooth.
07 - Gently fold the dry ingredients into the wet mixture until just combined. Do not overmix.
08 - Pour the batter into the prepared cake pan and smooth the top.
09 - Sprinkle the sliced almonds and 2 tablespoons sugar evenly over the surface.
10 - Bake for 38 to 42 minutes, or until a toothpick inserted in the center comes out clean and the top is golden.
11 - Cool in the pan for 10 minutes, then remove and let cool completely on a wire rack.
12 - Dust with powdered sugar before serving, if desired.