You are the one supposed to be abstaining, not the customers or proprietors of a restaurant where you work. Remember, there are even Catholics not obliged to abstain on most Fridays, for example, young children. Let it be more of a penance for you having to prepare the meat, smell it cooking, seeing others eating it while you abstain. The same would go for fasting. If it’s Ash Wednesday and you have to work, you not only must prepare meat and serve it to others, but you don’t get to eat something else instead.
In case you think you need to quit, that is also off base. Most of us would have to join the strictest of enclosed religious orders to avoid exposure to others who do live according to the Catholic Faith.