Shape the potato around the picadillo to form a round, smooth ball, making sure it is completely sealed. Place the potato balls on the baking sheet. Repeat
Place the balls on a baking sheet, cover with plastic wrap then refrigerate for 2 hours or overnight. If you skip this step, you risk the potato balls falling apart.
Bring balls to room temp. Heat oil to 350° in a large pot. Fry 1-2 potato balls at a time for about 2-3 minutes, turning occasionally. Drain on paper towels.