Yet though you can’t be a card-carrying foodie if you don’t know the provenance of your heirloom tomato, you apparently can be one if you don’t know how the members of your wait staff are treated. We don’t seem to mind or even notice that our servers might be making $2.13 an hour. That tip you debate increasing to 20 percent might be the difference in making the rent…. Take that $2.13 figure, the federal minimum wage for tipped workers. Legally, tips should cover the difference between that and the federal minimum wage, now a whopping $7.25. If they don’t, employers are obligated to make up the difference. But that doesn’t always happen, leaving millions of servers — 70 percent of whom are women — taking home far less than the minimum wage. Which brings us to the happily almost-forgotten Herman Cain. What’s called the “tipped minimum wage” — that $2.13 — once increased in proportion to the regular minimum wage. But in 1996, the year Cain took over as head of the National Restaurant Association (NRA), he struck a deal with President Bill Clinton and his fellow Democrats. In exchange for an increase in the regular minimum wage, the tipped minimum wage was de-coupled. The result: despite regular increases in the regular minimum wage, the tipped minimum wage hasn’t changed since 1991.