If using 20 oz. steak strips, follow same instructions as 10 oz. steak strips, cooking in batches if necessary until steak strips reach minimum internal temperature.
If using Impossible Burger, follow same instructions as steak strips in Step 4, breaking up burger until heated through, 4-6 minutes.
If using 14 oz. NY strip steak or 28 oz. NY strip steak, pat dry and season both sides with a pinch of salt and pepper. Follow same instructions to start as steaks strips in Step 4, cooking in batches if necessary until steak reaches a minimum internal temperature, 7-10 minutes per side. Remove steaks from pan and continue with Step 4, starting with adding the beef demi-glace. Rest steaks 3 minutes, then slice into 1/4" slices. And steak, then sauce to sandwiches.