To grill beef tenderloin on a gas grill, season the tenderloin and cook it with butter in a foil roasting pan set atop the grill grates. Ree Drummond offers a recipe for Ladd's grilled tenderloin on ThePioneerWoman.com.
Start by trimming the beef tenderloin using a sharp knife. Remove any silver tough membranes from the tenderloin without cutting the tenderloin into pieces. Set the tenderloin in a heavy duty foil roasting pan and pour 2 sticks of melted salted butter over the top. Season with 3 tablespoons of seasoned salt and 3 tablespoons of lemon pepper seasoning, adding more to taste. Set the pan on a grill and allow the butter to get hot.
When the butter is hot, cook for about 10 minutes, then turn the tenderloin and season the other side. Continue to turn every seven to eight minutes as the tenderloin begins browning. Add more butter if necessary. Continue cooking for 20 to 30 minutes depending on the thickness of the tenderloin. Use a meat thermometer to measure the internal temperature of the tenderloin. Take the pan off when the internal temperature of the meat reaches 125 to 130 degrees Fahrenheit.
Transfer the grilled tenderloin to a large cutting board and allow to rest for five to 10 minutes prior to slicing.