I stole this recipe from Good Eats, only his was for steak.

1 loin ~8" long, silver skin removed
roll loin in a little canola oil
season both sideswith fresh ground sea salt and black pepper

Heat a cast iron skillet at 500 F in an oven
Put burner on high
Take skillet out of oven and place on burner (use oven mitts)
place loin in hot dry skillet
sear 30-50 seconds a side
put back in oven and cook 2-3 minutes a side (med. rare)
take out and put on cutting board and cover with foil
rest for 5 minutes (very important)
Slice into 1/2" thick slices
optional peppercorn sauce can be served on side
Make yummy noises while eating