Losing salt and pickles IS losing freedom, in a way these students can understand.
If you deal in abstract political theory, the eyes of most folks are going to glaze over. When you can identify an issue that directly impacts someone, instead of acting the elitist, you should grasp the issue, and use it to recruit and motivate the resistance.
Yes and when these students become adults they will go the other way and try to FORCE people to eat pickles and salt. Of course it won't be pickles and salt but you get my drift. MYOB will not be learned.