I have a tremor, which varies in intensity. I recently ordered a sandwich at a restaurant, which was pretty easy to eat, but I gave up trying to eat the salad, because I was unable to do so with a fork. If I had been at home, I would have used my fingers to help get the lettuce on the fork (pushing the food with the fork, using my other hand as a backstop) or just picked up the leaves. Is this appropriate to do in public, or should I not eat anything unless I can do so reasonably politely?

I am middle-aged and have no other visible disabilities (which I mention since that might affect people's perceptions). I live in an urban area in the United States. If I am eating with another person, they would either already know of my tremor or I would tell them. Of course, I order foods that are relatively easy to eat (sandwiches, not soup), and I've started looking into adaptive silverware. I tip well and even more when I've been messy.