Pineapple Upside Down Pound Cake

or 3/4 stick) butter (salted is fine here)

packed dark brown sugar

heavy pinch of salt if using unsalted butter; wee pinch if using salted butter

about 6-8 oz chopped pineapple, (fresh or canned in juice)

unsalted butter

granulated sugar

best quality vanilla

gently rounded teaspoon sea salt

eggs, , beaten

cake flour

baking powder

chopped pineapple, (fresh or canned in juice)

sour cream