If making your own pistachio paste, make it ahead of time so it has a chance to cool. You can also make it up to 4 weeks in advance and store in the fridge. Alternatively, you can find pistachio paste online if you'd rather not make it at home.
Preheat oven to 350°F / 180°C (160°C fan-assisted) and grease two 8-inch cake pans. I also like to add parchment paper circles on the bottom to avoid sticking.
Cream the butter, sugar, and pistachio paste together until light and fluffy.
Beat in the eggs one at a time until incorporated.
Sift the dry ingredients together, then add half of the mixture to the cake batter. and mix in slowly.
Add the wet ingredients, then mix until completely incorporated.
Stir in the other half of the dry ingredients until there are no more lumps - but be careful not to overmix.
Fold the chopped pistachios into the batter.
Divide the cake batter between the prepared cake pans and bake for 30-35 minutes, or until a cake tester inserted in the middle comes out with a few moist crumbs.
Allow to cool completely before removing from the cake pans.
Once cooled, fill and decorate the cake with the frosting of your choice. You can turn most recipes into a pistachio frosting by adding a few tablespoons of pistachio paste right at the end. My favorite frostings to use on this cake are:- Italian Meringue Buttercream- Swiss Meringue Buttercream- French Buttercream- Russian Buttercream
Notes
If you are buying pistachio paste rather than making your own, make sure you get pistachio paste or pistachio butter - NOT pistachio cream. The ingredients should be 100% pistachios. See the post above for more info on this.