In a medium stainless steel bowl, beat the egg whites with a pinch of salt until soft peaks form. Add the remaining 1 tablespoon of sugar and beat until firm and glossy. Using a rubber spatula, beat one-fourth of the beaten whites into the banana mixture, then gently fold in the remaining whites. Spoon the soufflé mixture into the prepared ramekins and tap them lightly on a countertop. Transfer the soufflés to a baking sheet and bake in the center of the oven for about 15 minutes, or until golden brown and risen. Serve at once.