Problem is you guys force cows to eat corn instead of grass, I even remember as a kid during my first vacations in the US when some waitress at an upscale restaurant was bragging about their AAA grade corn-feed beef steak, which was only slightly less chewy than leather.

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Ethanol is made from corn--otherwise known as chicken feed.

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After beef cattle have grazed on pasture land for a year or two, they are usually sent to feed-lots, where they are fattened on a diet of hay and corn to prepare for slaughter.

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Eventually, says Gruber, his fermenting process will be adapted to use corn stalks or wheat straw--known as stover and now sold as cheap animal feed or plowed back into soil--to further knock down the cost.

FORBES: Magazine Article