Pork and Pine Nut Meatballs in Romesco Sauce

This meatball tapa, called pilota, is also known in the French Catalonian province of Roussillon by the same name or as bols-de-picoulat (literally, “balls of ground meat”). There are many different recipes, sometimes using pork, sometimes beef, sometimes sausage, and sometimes with the addition of chicken livers. But in almost all recipes, the meatballs contain pine nuts and cinnamon. These meatballs are sometimes found in the famous Spanish stew known as cocido, made