To remove the fat from the broth, you can spoon it off the top of the broth or use a fat separator. Or, if you have the time, refrigerator the strained broth for 8 hours or overnight (store the beef, chicken, and vegetables covered in the refrigerator). The next day, the fat will have risen to the top and hardened and can be easily removed. Proceed with the stew, adding the shredded beef and vegetables to the broth while reheating it.