"You have to plan ahead for this one - buy ripe bananas and let them get nearly black/brown before accepting them as the rrrrrripe bananas needed for this recipe. Another great option: we peel just-ripe bananas, freeze them, and let them finish developing their flavour in the freezer for 2 days or up to 2 weeks. Said rrrrrripe bananas are the difference between having your banana pie tasting like banana Laffy Taffy and the most delicious, deep banana cream pie ever. When you make the pie shell, use disposable kitchen gloves to keep your hands from looking like a mechanic's who just changed someone's oil."
Note One silver-strength gelatine leaf will set 250ml of liquid to a firm set. If you can't find silver-strength gelatine leaves, you can substitute an equivalent quantity, in terms of setting power, of other gelatine leaves.