Potato salad was a type of salad whose chief ingredient was potatoes.
In Benjamin Sisko's vision of 1953 New York City in 2374, potato salad was available in Mrs. Jackson's restaurant. (DS9: "Far Beyond the Stars")
A hologram of B'Elanna Torres offered Seven of Nine some dinner during a simulated visit to the mess hall in 2374, saying that "the potato salad [wasn't] half bad." (VOY: "One")
For a romantic lunch in 2378, Tom Paris replicated B'Elanna Torres' favorite variant of potato salad with extra paprika. (VOY: "Renaissance Man")