[Brazil] How to cook Passionfruit cake (bolo de maracujá)

Ingredients
- 4 eggs, separated
- 330 g (1½ cups) caster sugar
- 100 g unsalted butter, softened
- 300 g (2 cups) plain flour
- 2 tsp baking powder
- 250 ml passionfruit pulp (about 12 passionfruit)
- 60 ml passionfruit pulp (about 3 passionfruit)
- 220 g (1 cup) caster sugar