This dish is a favorite at town fiestas. Long, slow simmering makes the beef tender, while the Spanish sausages, peas and olives add richness to the taste.
Heat 2 tablespoons of the oil in a large casserole or wok and sauté the beef until evenly browned. Place the beef and oil in a stockpot. Add the onions and pour in the water. Bring to a boil, then reduce heat to low and simmer.
Meanwhile, grill the pork liver under a broiler until it is half cooked, about 7-8 minutes. Remove from the grill and chop finely.