Marinate roast overnight; drain and place in a Brown and Serve bag, according to directions on package. Add a little salt, pepper and garlic powder on meat. Bake about 1 1/4 hours, per pound at 250- 300 degrees. (Be sure to punch the hole in the bag.) When done take out of bag and cool. Then slice thinly and put into aluminum foil pan. Pour barbeque sauce over and cover with foil. Bake until hot. Makes delicious barbequed beef sandwiches.