Mango, pineapple and ginger upside-down pudding

Name: Mango, pineapple and ginger upside-down pudding
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Ingredients: 1 fresh mango; ¼ fresh pineapple; 250 g (9 oz) dark chocolate, chopped or in drops; 110 g (4 oz) unsalted butter; 75 g (2½ oz) sugar; 2 eggs; 80 g (3 oz) flour; 1 teaspoon baking powder; 1 tablespoon preserved ginger, chopped into small pieces (if you cannot find any, use 2-3 teaspoons ground ginger according to taste); 1 tablespoon preserved ginger, chopped into small pieces (if you cannot find any, use 2-3 teaspoons ground ginger according to taste)