If referring to a single pepper:
* Isang paminta (formal)
* Paminta (informal)
If referring to a single pepper seed:
* Isang buto ng paminta (formal)
* Buto ng paminta (informal)
If referring to a single pepper used as a spice in cooking:
* Isang patak ng paminta (formal)
* Patak ng paminta (informal)
Note:
* Paminta is the general term for pepper in Tagalog.
* Buto means seed.
* Patak means drop (used when referring to a spice).
You can choose the appropriate term based on the specific context.