Season tenderloin with salt and pepper. Then place over medium-hot fire and grill for about 15 minutes or internal temperature reaches 145 degrees F. Rotate tenderloin half way through cooking time.
While tenderloin is cooking, mix apricot jam or preserves, mustard and crushed garlic in a bowl.
he last few minutes of grilling, take half of the mixture and brush on tenderloin, reserving other half as sauce to apply during mealtime.