I had 1# frozen shredded beef leftover from Christmas and turned it into a wonderful comfort favorite.
I sweated an onion with a few button mushrooms until soft.
Add 3 TBS flour by sifting into the onion/ mushroom mixture a little at a time until it starts to thicken. Add 1 cup milk or half & half while stirring. Add thawed beef and stir in. Serve over pasta or mix together before serving and serve over mashed potatoes.