In a small bowl, mash the banana very well, until it is the consistency of a think liquid and there are no chunks left. I used my hand mixer on the slowest setting to help with this process,
In a separate bowl, whip the cream, sugar and vanilla until stiff peaks form. Fold in the mashed bananas to the whipped cream.
Spoon or pipe over anything!
For the strawberries and biscuit jars
Break 3 crispy sponge fingers into each jar and top with a generous handful of strawberry pieces.
Pipe the banana whipped cream over it using a large piping star.