Causa Trucha Ahumado

Causa is a savory cake made from mashed yellow potatoes typically seasoned with lime juice, onion, oil, and, sometimes, puréed chiles. It is often formed into a dumpling shape and served cold along with hard-boiled eggs and olives. I learned some of the finer points of cooking Peruvian potatoes and making causa from the executive chef of Adina, the award-winning Peruvian restaurant in Portland, Oregon. For this recipe, Peruvian purple potatoes are used. To ret