Tropical upside down pineapple cake

Name: Tropical upside down pineapple cake
Prep time: 10 min
Cook time: 1 h 10 min
Total time: 1 h 10 min
Yield: 12 portions
Ingredients: 50 g salted butter; 80 g brown sugar; 1 fresh pineapple; 2 eggs; 100 g grapeseed oil; 150 g caster sugar; 100 g yoghurt; 200 g coconut milk; ¼ tsp coconut essence; 300 g plain flour; 2 tsp baking powder; 2 pinches sea salt; whipped cream