Pineapple Butter Cake

unsalted butter (120 g)

chopped pineapple (300 g)

all purpose flour (80 g)

baking powder (2.5 g)

salt (2.5 g)

whole eggs plus 1 egg yolk

vanilla extract (5 ml)

granulated sugar (200 g)

grated lemon zest (2.5 g)

Confectioners sugar to dust