Peel and slice potatoes and boil them in beef broth for 4 minutes. Strain with a slotted spoon to a towel-lined plate until room temperature, then place between 2 layers of paper towels and put away in the refrigerator for about 24 hours.
24 hours later... Preheat air fryer. Toss potatoes with olive oil and place in the fryer in one layer. Cook them for 7 minutes and then turn or toss them and cook for another 3 minutes or until the desired brownness. Quickly salt and pepper to taste and serve hot.
*You can cook these in a regular oven on a foil-lined baking sheet at 400° for 10 minutes, flipping them over ½ way thru.