Thanks dls. A lot of people have the same Morton's misconception on this tri tip as I did, including everyone at the dinner party the other night. So when I went to Costco looking for it, I just saw Morton's label and didn't look any further. My bad. Last night's tri tip was still amongst the most tender I've ever eaten. I think it must have to do with the long term marinating as well as the beef cut.
We had my son and fiance over last night for dinner and to taste test/select champagne for his wedding. Lots of fun and a good dinner.
I threw the tri tip into the smoker at 250* all the way until it hit an internal of 130*, about 1.5 hrs. Used 1.75 oz of mesquite and 1.75 oz of wild cherry. Nice smoke flavor. It sliced so easily that I didn't need the Forschner, could have used a butter knife.