As its name suggests, Ensalada Rusa, Russian Salad, has its origins in Russia. Over generations, it inched its way west to Spain, Portugal and Italy, and then made the jump to South America with waves of European and Russian immigrants.
At its most simple, it consists of boiled potatoes, peas, and carrots swathed in a generous helping of mayonnaise. Served as a main dish, one can add sliced hard-boiled eggs, baby shrimp, cubed chicken or ham. Some people add beets or asparagus; it's all a matter of taste.