Bring the all purpose butter to 24°c / 75.2°F. Whisk all purpose butter with icing sugar until smooth. sift flour with baking powder. add half of flour mixture, half of eggs, and salt to cream mixture. Mix well, and then add remaining flour and eggs. dilute pistachio paste with milk and oil. Mix the pistachio milk mixture with 1/3 of the batter. Then mix in remaining batter. Fill 3 cake pans with alternating layers of batter and brandied cherries.
Bake at 160°c / 320°F for 60 min. Temperature in the middle 102°c / 215.6°F. Remove from cake pans and let cool on cooling rack.