Peel the banana and cut it into slices for convenience.
Add the banana to the milk and whisk everything together.
Dissolve the gelatin according to the instructions on the package.
Pour the gelatin through a sieve into the milk and whisk everything again. I use a sieve so that undissolved pieces of gelatin do not accidentally fall.
Pour the jelly into the bowls.
Grate the grated chocolate on top and put the banana milk jelly in the refrigerator to freeze for about 2 hours.