39 minutes ago, weinoo said:Pickles and their juices? Reminds of of Salade Russe a bit (but only).
I still haven't heard back from Antonia and her friend, but a few links I checked out elsewhere on the internet said that peas, grated carrots and grated onions are characteristic of Slovakian potato salad. The unusual seasoning wasn't as evident in the leftovers, but I could detect mustard. It wasn't as sweet as many American potato salads, but it didn't have dill pickle either.