I make it both ways, in a smoker and in the oven, I will tell you how I do mine, if you want quicker jerky, and not take olot of time making the marinade, go to the Groc. store and get a bottle of Dales meat marinade, it is mainly made up of Soy sauce and Wishtershire(sp) and spices, cut your meat as describe above from others, I too beleive that 1/4 inch is best, I really dont payattention to the grain as I cut mine as large as the piece of meat will allow. Marinate the meat atleast overnight. I then dump the meat into a strainer or colonder, then I stack paper towells on the counter and lay the meat on it, spread out and then take a buch of paper towells and tamp the meat to remove all the excess fluid on it. I then turn on the oven to 150 or just warm, what ever is the lowest setting, I stick toothpicks into the top of the meat and hang it on the rack up high, I do not have to line the bottom of the oven due to the papertowells to remove the moisture, leave a spoon or something in the oven door to prevent in from closing completely and in about 5-7 hours you'll have some awesome jerky. It is the quickest way, I do it all the time, as for the best cuts of meat, the backstraps ofcourse, but a roast works just as well, just try to remove all fat, fat will not dry and goes rancid. store in airtight place. Good Luck.
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