Crust on the edge of the glass
There are different versions for this type of decoration, but you should choose according to taste:
The glass is dipped headfirst into the selected (sticky) liquid, and then into the selected crumbs.
Some examples:
1. lemon juice and sugar
2. sugar water and coconut
Of course you can also use other fruit and vegetable juices (for example apple juice).
For not sweet drinks, a salt edge is recommended.
Variations with ground nuts, or the use of cucumber water (fresh cucumbers), I have not tried and therefore can not judge.