Prepare banana (125 g) and rolled oats (75 g) for one serving. Mash banana, combine with oats and additions, press into a small lined tin and bake at 180°C until set.
Prepare strawberries (100 g) and pistachios (16 g). Add them during the final cooking stage or as a fresh garnish, as appropriate to their texture.
Taste and season to preference. Serve at the temperature appropriate for the dish; refrigerate leftovers promptly.