Make shepherd's pie. In addition to the meat, you could use leftover gravy and veggies. You'll need mashed potato for the top crust.
if you need to stretch the meat, add veggies in a one pot dealio. how about wokkin' it (or using your d.o. like a wok), and make a version of steak kew.
in a wok/d.o. with super hot peanut oil, stir fry the cubed chunks of meat for just a minute to brown, then set aside. next, stirfry some cubed sweet onions, halved mushrooms, halved baby bok choy, minced garlic and ginger. add a little beef stock, butter, and red wine. reduce for a minute or two while the veggies sweat, add the meat back in.
simmer for just a minute more, then add a cornstarch slurry to thicken the sauce.
serve with white rice.
I made shepherd's pie with my leftover prime rib from Christmas day. I further roasted the meat, they gave out quite a bit of fat, kind of a confit in the pan, as well as giving a nice base for the sauce. I trimmed the meat into bite-size pieces. Drained the fat, used leftover au jus, thickened with cornstarch in the pan, added the meat back into it. Then I put a ring of leftover vegetables, peas on one side, leftover green beans on the other (I like the beans, my husband likes peas), leftover smashed potatoes in the center.
So, how did it taste?