A local favorite for this type of place is a taco bar .... oops, you already said that. Of course next month, corned beef dinner. Another local favorite is Italian roast beef sandwiches (think French dip with Italian seasonings in the broth). Various kinds of meat balls -- in brown sauce, or tomato, or creamy sauce, in a crock or chafing dish, served on buns or noodles or whatever starch folk in your area like. If you don't mind buying meatballs frozen in bulk from a company you like, you can do a myriad of things with them, from browning and skewering them for a happy hour snack, to putting them in tomato sauce, not just over spaghetti, but on a sub-type bun with some mozzerella melted on top, to a brown or white sauce over noodles or rice. Add a little sour cream to the brown sauce, and you have stroganoff.
Where are you? That sometimes determines what people will like.