Fry the Potatoes. Heat a large skillet over medium-high heat. Add half of the olive oil. When the oil is shimmering, add the potatoes and fry and turn them until they are golden brown on all sides.
2 Tablespoons Olive Oil, 2 Cups Cooked Potatoes
Sauté the Onions. Push the potatoes to one side of the pan and add half of the remaining olive oil to the empty side of the pan. Add the red onions and cook them for 1 to 2 minutes, stirring and turning them often.
½ Cup Red Onion
Sear the Leftover Roast Beef. Push the onions into the potatoes to one side of the skillet and add the last of the remaining olive oil. Add the leftover roast beef. Let the roast beef fry and brown for 1 to 2 minutes. Then mix and turn it into the fried potatoes and onions. Let the hash sizzle and cook, stirring and turning it until it is heated through. Taste and season with salt and pepper as needed. Serve and Enjoy!
2 Cups Leftover Roast Beef, ½ Teaspoon Salt, ½ Teaspoon Black Pepper
Notes
My Top Tip♡ When cooking hash, it is important to sear and brown the potatoes and leftover roast beef as much as possible. Keep the hash moving as it sizzles in the pan for great caramelization and flavor!Make-Ahead, Storage, & Reheating InstructionsMake-Ahead: Leftover Roast Beef Hash can be made in advance and stored in a covered container in the refrigerator for up to 3 days.Freezing: You can freeze leftover Roast Beef Hash in a freezer-safe container for up to a month. To reheat frozen hash, let it thaw in the refrigerator overnight and then reheat it as directed below.Reheating: Simply heat a large skillet over medium-high heat and add 1 to 2 teaspoons of cooking oil. When the oil is shimmering, add the hash. Stir and turn the hash, then add 1 to 2 tablespoons of water, cover the pan, and reduce the heat to medium. Let the hash cook until it is heated through.