Slice the two steaks down the center and pound them to 1/2-inch thickness. Season each side with salt and pepper.
In one bowl, add the flour, in a second bowl, add the egg, and in a third bowl, the panko bread crumbs.
Moving quickly, dip the steak in flour, followed by the egg, then the panko bread crumbs.
Add two inches of oil to a nonstick pan and heat over medium heat. Once it reaches about 375F, add the panko steak and cook for 4-5 minutes, flipping halfway through. The katsu is cooked when it is deeply golden brown on both sides.
Remove the steak from the oil and place them on a paper towel to soak up excess oil. Drizzle with katsu sauce and serve.
Notes
* Use any oil with a high smoke point like peanut, safflower, canola, or vegetable oil. TO STORE: Place leftovers in a shallow container and store them in the refrigerator for up to 3 days.TO FREEZE: Place the cooked and cooled beef in a shallow container and store it in the freezer for up to 3 months. Thaw overnight in the fridge. TO REHEAT: To achieve the same crispiness, I recommend reheating the beef katsu in a hot skillet (no oil) until both sides are crispy.