Preheat the oven to 175 degrees Celsius. Then line a 8 inch round baking pan with baking paper, and use a brush to cover the baking pan with some olive oil or use a non stick spray.
In a large bowl mix: the sugar, olive oil, ricotta, eggs and vanilla extract.
In the same bowl add the flour, ground pistachio, baking powder and salt. Stir until everything is combined well.
Pour the baking mix in the baking pan and bake in the oven for 40-45 minutes, or until no more crumbs come off on a skewer stick.
Take the cake out of the oven and let it cool for about 20 minutes. After the cake is cool down, remove it from the baking pan and let it cool once more.
Additionally you top it off with some powdered sugar and pistachios. Enjoy!