When I first read that bananas are popular in West Africa’s island country São Tomé and Príncipe, I envisioned them eaten raw on the surf-swept beaches… or perhaps sold battered and fried with a cloud of powdered sugar. While all this certainly does happen, I never imagined I’d see them folded inside of a fluffy mousse, decked out with indulgent curls of dark chocolate. But I’m sure glad I did. In my reading I learned that this mousse could be made any number of ways – with or without eggs (I even read one account of some part of a leaf being used to thicken the cream, perhaps they meant agar agar?) – but however you make this, the simpler the better. The method I chose is a ready-in-15-minutes kind of mousse and there are so few ingredients it’s silly. The key to the mousse are 1. really, really ripe bananas and 2. really, really ripe bananas. In fact, they are perfect when they fall into a smooth puree with the slightest of pressure from the …