In the United States, you can find several mayonnaise-based salads: potato salad, tuna salad, and egg salad. In Spain, they don't really have any of that, but they do have Ensaladilla Rusa (Russian Salad). Ensaladilla Rusa is a combination of all of the above.
My wife had a Russian immigrant friend when she was a child and acquired intelligence that suggests that they really do eat this dish in Russia, but I have no other corroborating evidence. Personally, I have never seen this dish outside of Spain.
Peas and corn waiting to be sprinkled on top
The final product. Notice the radial symmetry.
Enjoy! It's a great side dish with any meat or fish.