Apple Upside Down Cake

Ingredients

• 1 apple
• 1/2 tsp cinnamon powder
• 1/4 tsp nutmeg
• 1 cup granulated sugar (200 grams)
• 1 tbsp corn syrup, or glucose (read notes)
• 1/4 cup water (60 ml)
• 1 1/2 cup all-purpose flour (191 grams)
• 1 tsp baking power
• 1/4 tsp salt
• 1 tsp cinnamon powder
• 1/2 tsp nutmeg
• 3/4 cup unsalted butter (room temperature (170 grams))
• 3 large eggs
• 1/2 tbsp vanilla extract
• 1/3 cup buttermilk (78 ml)