Hello.

Only the Alder crispa gives the Dune pepper.

We collect the small cones in November, dry them for about 1 month and put them in a mortar.
[Linked Image from i.ibb.co]
[Linked Image from i.ibb.co]
[Linked Image from i.ibb.co]

Another which gives wild pepper, the Myrica gale, we use its small yellow cones and its leaves.
A+