First you prepare the filling and chill it for a couple of minutes.
It has a grated raw mango, onion, green chilly, garlic, salt and coriander:
While its chilling, cut a cucumber and remove the seeds like this:
Just before serving fill the cavity.
Don’t tell your guests what the filing contains so you can watch their eyes go wide and then a big grin as the sourness of the raw mango hits only to be immediately mellowed by the coriander. Totally worth it.