Slit the vanilla pod lengthwise, open it and scrape it, recovering the seeds.
Place the seeds in the blender along with the banana (net weight, no peel) and a teaspoon of lemon juice.
Start the blender on low speed for 2 minutes.
Pour the resulting cream into the dish.
Garnish with peeled and sliced kiwi fruit and fennel cut into very thin slices, using a slicer or mandoline.
Notes
For an even cooler and more aromatic variation, you can add a pinch of fresh grated ginger or a teaspoon of honey to further sweeten the cream. This recipe is ideal for a summer breakfast or as a light dessert after dinner.