Pineapple Upside Down Cake

Topping

• 5 oz brown sugar
• 4 oz unsalted butter, diced, room temperature
• 6 - 7 slices canned pineapple, in juice, plus 5 oz juice

Batter

• 6 oz confectioners sugar
• 6 oz unsalted butter, diced, room temperature
• 2 large eggs
• 3 tbsp dark rum, divided
• 1 tsp vanilla extract
• 8 ½ oz all-purpose flour
• 2 tsp baking powder
• ⅛ tsp salt