Use a well-marbled chuck-eye roast in this recipe. When trimming the beef, don’t remove all visible fat—some of it will be used in lieu of oil later in the recipe. If you don’t have enough reserved fat in step 3, use vegetable oil. Vaca Frita is traditionally served with black beans and rice or fried plantains. It can also be used as a filling for sandwiches, empanadas, and even tacos.