If I could implore you to do one thing whenever you cook brisket, it would be this: Make extra brisket and freeze it. Beef brisket is better the day after it is cooked, but it can be momentarily life-changing when you remember you have some ready and waiting in the freezer. This simple tip for freezing those leftovers will ensure that you can take the leftovers and turn them into breakfast, lunch, or dinner anytime.