I recently discovered Ela's Deli in Columbia SC (located on Forest Drive, near Fort Jackson's main gate right off I-77). The food and catering are fantastic.
The owners are Polish and Latino (not sure, but from Central America, I think) and there are both type foods on the menu. It is all fresh, and of the highest quality. You may have to wait a bit for your food, but it is all freshly made! They have the BEST Reuben I have ever eaten, and the second best Cuban Sandwich outside of Miami that I have tasted. The black beans are perfect, and the Pirogues are homemade and delicious. One of the days I visited a Polish / American Polish speaking soldier from Fort Jackson was ordering a ton of Pirogues for the holidays. The Polish potato salad is the hands down best I've had. Also, the Sunday brunch is fantastic. It is a hole in the wall place, but the owners are the warmest, nicest people you'll meet. I highly recommend it! There are lots of locals from upscale Forest Acres and Shandon who love the place. If you're looking for authentic Polish or Latin (broad, I know) food in Columbia, this should not be missed!