Finely chop the pineapple.
Cream the butter and sugar together.
Add the eggs one at a time, mixing well after each addition.
Sift in the cake flour and baking powder, then add to the mixture.
Mix in the pineapple pieces.
Pour the batter into a pound cake mold.
Bake at 180°C (356°F) for 40–45 minutes.
Let it cool, then remove from the mold.