Step 1

Preheat oven to 350 degrees Fahrenheit or 175 degrees Celsius.

Step 2

Butter the sides and bottom of a 9-inch round cake pan and line the bottom with parchment paper.

Step 3

In a medium bowl, combine the flours, sugar, baking powder, and salt, and whisk gently.

Step 4

In a large bowl, whisk together the ricotta, eggs, vanilla extract, lemon juice, lemon zest, and olive oil until the oil is fully incorporated.

Step 5

Then add the dry ingredients to the liquid ingredients and stir just until the batter comes together.

Step 6

Pour the batter into the pan. Bake for 30 minutes, until top is golden brown and springy.

Step 7

Remove cake from oven and put onto a cake rack to cool.

Step 8

After 15 minutes, when cake is still warm, invert cake pan onto a plate to unmold. Remove the parchment paper, then flip right-side up again.

Step 9

Sprinkle with powdered sugar to serve.