In a bowl sift together all purpose flour, granulated sugar, baking powder, baking soda and salt. Set aside.
In another bowl whisk together all the wet ingredients: egg, buttermilk, vanilla, pineapple juice and oil.
Add the dry ingredients into the wet in 3 parts.
Whisk until just combined. Do not overmix.
Topping
Melt butter in the microwave and pour into a 9X2 round cake pan.
Sprinkle brown sugar uniformly over the butter.
Place 1 pineapple ring in the middle of the pan and place the cut slices all around in a fan shape.
Arrange cherries between the pineapple slices [see pictures].
Carefully pour the cake batter on top taking care not to dislodge the cherries.
Bake
Place the pan on a cookie sheet [because some oil might ooze out and create a mess in the oven] and bake at 350 F degrees for around 40 minutes or till a toothpick inserted in the center comes out clean.
Take out the cake from the oven when done and let it cool for around 30-40 minutes.
Flip over the cake directly onto your serving plate.