We doubled the recipe..thinking I was going to have some left over for 2 of us. Was I wrong. These were fantastic and really easy. Note to self: you can make these ahead of time but tossing the zucchini into a bag and leaving until ready to dump on the cookie sheet.
Drizzle vegetable oil into an aluminum or cast-iron pan, and heat the pan on the stove until the oil just begins to smoke. Add your flank steak to the pan. Cook one steak at a time. Sear each side of the flank steak for 2 to 4 minutes. Use fork or tongs to turn the flank steak once. Test the flank steak with a meat thermometer for at least an internal temperature of 145 F right before you anticipate the cooking time for your steaks to end.
Place a 10-to-12-inch cast-iron skillet in the oven and heat the oven to 500 degrees F. Bring the steak to room temperature. When the oven reaches temperature, remove the skillet and place on the range over high heat for 5 minutes.Coat the steak lightly with oil and sprinkle both sides with a generous pinch of salt.Grind on black pepper. Immediately place the steak in the middle of the hot, dry skillet.Cook 30 seconds without moving. Turn with tongs and cook another 30 seconds, then put the pan straight into the oven for 2 minutes.Flip the steak and cook for another 2 minutes. (This time is for medium-rare steak.rind on black pepper. Immediately place the steak in the middle of the hot, dry skillet. Cook 30 seconds without moving. Turn with tongs and cook another 30 seconds, then put the pan straight into the oven for 2 minutes. Flip the steak and cook for another 2 minutes. (This time is for medium-rare steak.