Beefs are not noted for high intellectual achievement, but they do need a fairly sizable brain to run all that musculature and complex stomach system. While called for in many older recipes, brains are not as popular today (OK, I could make a snide comment about excessive TV exposure, but I won't). In particular the USDA frowns on beef brains due to the possibility of mad cow disease, and will only allow them to be harvested from very young beefs where the risk is minimal.
Brains have long been used in the cuisines of cattle raising peoples, particularly in Europe and to a lesser extent in North America. You'll encounter recipes calling for them in some older American cookbooks, but they still appear in current European cookbooks. This item has almost disappeared in North America and is now very hard to find in most markets.
Cooked, brains are grayish and don't look at all appetizing - and that's a very accurate impression. They have a texture similar to tofu but more elastic, and a bland flavor that hints of tongue and liver. Though I like tongue and liver, brains just do it completely wrong. Yuk!
More on Beef Innards
I gather from my recipe books that a "calf brain" weighs about 6 ounces, so that's the amount to use when the recipe calls for "1 calf brain". A full grown cow brain is about 1 pound. The USDA allows harvesting only calf brains.
The other major problem with brains is the possibility of BSE (Bovine Spongiform Encephalitis - Mad Cow disease). This is believed able to infect humans and is then called New Variant Creutzfeldt-Jakob Disease (vCJD). This disease is caused by a malformed protein which is not destroyed by normal cooking heat, not even "well done", and there is no known treatment. There have been from 1 to 3 deaths in the United States, probably from exposure while living in the UK where the infection of cattle was severe due to unwise feeding practices. I've heard of only one cow found infected in the United States.
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