Preheat the air fryer to 350 degrees F / 180 degrees C, then place the steak into the air fryer basket.
Reheat steak, checking every 2 minutes until the internal temperature reaches 110 degrees F - 130 degrees F / 43 degrees C - 55 degrees C. Total reheat time depends on the thickness of your steak.
Grill Method
Preheat the grill to medium-high heat.
Sear the steak for 1 minute on each side, then move the steak to get indirect heat and warm for about 3 minutes before checking the temperature with a thermometer.
Check every 2 minutes, until the steak reaches a temperature of 110 degrees F - 130 degrees F / 43 degrees C - 55 degrees C.
Oven Method
Preheat the oven to 250 degrees F / 120 degrees C. Place the steak on a wire rack on a baking sheet.
Heat until the steak reaches an internal temperature of 110 degrees F - 130 degrees F / 43 degrees C - 55 degrees C. This will take about 20 minutes, depending on the size of the steak.
For a crispier exterior, melt butter in a skillet and sear the reheated steak on each side for about 1 minute before serving.
Skillet Method
Place a small amount of oil in a skillet that’s been heated to medium.
Add the steak and cover with a lid. Turn over after 1-2 minutes and check the temperature.
Flip after each 1-2 minute interval, until the steak is heated through and has reached an internal temperature of 110 degrees F - 130 degrees F / 43 degrees C - 55 degrees C.
Notes
Allow the cold steak to come to room temperature for about 20 minutes before reheating.
Thinner steaks will reheat faster, so cook similar-sized pieces of meat together.
Watch closely, as cooking times will vary based on thickness.
Use a meat thermometer to check the internal temperature so you don’t overcook the meat.
To keep leftover steak juicy, you can marinate in a bit of beef broth to keep the meat moist during the reheating process.
Storage - keep leftover steak in an airtight container or wrapped in plastic wrap in the fridge for up to 5 days.