Just to be scientific about this, I went to cash and carry, bought a 13lb corned beef brisket, rinsed it off, coated it with a black pepper/coriander/garlic rub and smoked it at 210*F for 9 hours. After it was done I had a few slices to see how it came out - it's a definite cross between pastrami and corned beef. I let it cool and put it in the fridge, the next day I steamed it for 3 hours before making a sammich - this definitely tastes like pastrami, no question about it. The homemade pickles complete the meal. The other end of the brisket is significantly more marbled and I expect it will taste better than the very lean part that this sammich was made from.