We usually have roast leftover from Sunday dinner. When it is placed in the refrigerator, the fat that is floating on top will solidify and can easily be removed the next day.
Cut the leftover meat into bite-sized pieces and return it to the broth. Add extra vegetables, if desired – either more potatoes and carrots, other leftover vegetables, or a bag of frozen vegies of your choice. My kids like a jar of pumpkin stirred into the broth.
For soup, heat and eat. For stew, thicken. Broth can be thickened with lots of vegetables, or with rice or barley. If you’re not contending with wheat or corn allergies, stew can be thickened with flour or cornstarch.