Get your nutrient-packed protein intake with Rumba Meats beef liver. Not only is beef liver rich in iron â itâs also tender and flavorful. To prepare the best beef liver, we recommend cutting it into strips, then soaking it in milk for a couple of hours prior to cooking. Beef liver cooks up quickly in the skillet, but itâs also great for the grill. The trick is to cook it at a high temperature for a short time. You can also use beef liver in any dish youâd typically use ground beef, such...