Let the steak rest and come to room temperature, which takes around 10 to 20 minutes depending on the thickness of the steak. Dry the surface with a paper towel and sprinkle on salt and pepper, patting so the seasonings adhere well
Heat a cast iron skillet or grill pan on the stove. Add a tablespoon of high-heat oil or clarified butter. Sear the surfaces of the T-bone steak in the pan, leaving it for three minutes or so on each side
Set the slow cooker to high or medium heat. Place the steak in the cooking compartment, then pour in the cooking liquid to the side of the steak. Cover the cooker and set it to run for at least two to four hours
Begin checking the steak’s internal temperature at the two-hour mark. Use a doneness chart for the T-bone steak cut to find when it’s done to your preference. It’s easier to get medium to medium-well doneness than any other level with this cooking method