This is why I don't like to eat out

[danceofeternity]

Let's say you don't eat meat, for whatever reason. You order a veggie omelet at a restaurant, get it and eat it. Your last bit you look down at your plate and you notice a piece of ham. It's ham, you know it's ham, no veggie looks like that.
Who knows how much ham was in the omelet.
What do you do? What do you say? What should the restaurant(manager, owner) do or say?