I had a gift card to Trader Joe's, and whilst perusing the various selections, I stumbled upon a tri-tip roast. It was then that I remembered reading about Santa Maria "BBQ", and the popularity of this cut of beef, which is largely unavailable on the East Coast - I've never seen it outside of TJ's. I picked one up, and prepared it according to tradtion - rubbed only in salt, pepper, and garlic salt. I prepared a live oak fire, and let it burn down to large coals. I seared the roast quickly, then moved it to the cold part of the grill, but not before adding a less-traditional garlic paste to the top of the roast. I let it hang out for about 45 minutes @ 250 degrees (temperature dropped down pretty quick last night, I would have liked to have kept it around 325-350).
I don't know if it was the seasoning, oak coals, cut of meat, or the fact that it was grass-fed & hormone free, but this shit fuckin ruled. A great balance of tenderness and flavor. The odd thing was that the sections cooked a little past medium were better than those cooked medium rare. The garlic paste also roasted and carmelized nicely.
I highly recommend picking one up and giving it a shot.