Pineapple Upside Down Cake with (Rum) Caramel - Pure Gold Pineapples

Ingredients

• ½ large pineapple
• ⅓ cup brown sugar
• 50g salted or unsalted butter
• 2 tablespoons rum (we used Bundaberg), optional
• 1 cup plain flour
• 3 teaspoons baking powder
• ½ cup rolled oats
• ½ cup shredded coconut
• ¾ cup raw sugar
• 2 eggs
• ½ cup milk
• ½ cup olive oil or macadamia oil, plus extra for greasing
• 1 teaspoon vanilla extract