In a bowl whisk together flour, sugar, and baking soda. Fold in pineapple juice, melted butter, milk, and vanilla extract. Stir until smooth.
Take your pan out of the fridge and pour over your cake batter.
Bake in a preheated over of 350 degrees in the center rack for 30-45 minutes. If it browns to fast for your liking you can place tin foil over your pan.
After 30 minutes of cooking check ever 5ish minutes with a toothpick in the center of the cake until it comes out clean.
Cook cake for 10 minutes. Then flip pan over and remove pan from cake. Let cook all the way to room temperature before slicing it. Eat and enjoy!