Amarie enjoying her suck salt.
Suck salt was a product made of salt pressed into a stick, which is licked by the consumer. Amarie enjoyed this, although she characterized it as a nasty habit. When offered a stick, William Riker stated that he "never cared for it". (TNG: "Unification II")
The Star Trek Encyclopedia, (3rd ed., p. 481) identifies this as Sodium chlorine (ie the same as table salt) in solid crystal form.