Step 1

Mash the butter with the miso in a small bowl. Mix in the truffle oil.

Step 2

Season the steak well with salt and pepper. Let sit at room temperature for at least 1 hour or refrigerate uncovered for up to 48 hours.

Step 3

If the steak is refrigerated, let it come to room temperature before grilling. For a charcoal grill, light a chimney starter full of charcoal and bank the coals against one side of the grill. For a gas grill, start with all burners on medium high and then turn off one or more of the burners to create a hot zone and a cool zone.

Step 4

Pat the steak dry and grill over the hottest part of the grill, rotating it occasionally to create a crust, until well browned on one side, 2 to 4 minutes. Flip and sear the other side.

Step 5

Move the steak to the cooler part of the grill, cover, and cook to your desired doneness (about 5 to 10 minutes for medium-rare).  Let rest 5 to 10 minutes, cut the steaks in half, top each piece with 1 to 2 Tbs. of the butter and serve.