We do potato salad up here. Some like it egg-ey and some like it mustardy. Some like it with that German vinegar style. Lot of Germans around these parts so potato salad is pretty common. My sister in law whips up a great batch for many get togethers.
But gumbo... nope. Jambalaya? Pretty much only at a few restaurants. Most of those foods require spices other than black pepper and salt so it's a no go around these parts.