Scrub potatoes and cut in half. Place i a bowl of water and soak as long as possible before cooking. This will release a lot of starch. Cook in skillet or on griddle till browned.
Chop or shred leftover roast. Slice onion and chop pepper. You can use bell, anaheim, jalapeno or poblano. Cook onion and bell pepper in a couple tablespoons of olive oil till tender, add in beef, stock and spices, stir till warmed. Mix hash browns in with beef mixture.
Serve has over bread, toast or rolls with your favorite eggs.