Pre-heat the oven to 170°C / 160°C Fan. Butter a Le Creuset Stoneware 32cm Heritage Rectangular Dish.
In a large mixing bowl, beat the eggs, sugar, ricotta, milk, lemon zest and vanilla paste together until evenly combined. Add the flour and incorporate, followed by the butter, and mix well. Add the ground and whole pistachios and give everything a thoroughly good mix to make sure the mixture is smooth and evenly combined.
Pour the cake mix into the buttered dish and smooth over the top to make sure the batter is evenly distributed and the surface is at. Sprinkle the 2 heaped table spoons of extra sugar over your batter at this point (this is an optional step).
Place in the oven and bake for 45 minutes or until golden on top and a skewer/knife inserted into the centre comes out clean. Remove the cake from the oven and allow to cool. Slice into squares and serve