I just thought that I would would share the most interesting thing that I learned this week, mostly because I need a distraction from the paper that I am half finished writing. In Food Technology, we started applying everything we have been learning about bacteria, spores, fungus, and food preservation to some concrete products. The class this week was on dairy.
There is a unique situation in Italy in that about 85% of the county in mountainous so there is relatively little room for grazing. Therefore, most dairy cows are raised in barns, and are fed silage (corn that has been held and fermented in silos). But there is a certain bacterial spore that is present in silage and when it is feed to the cows the spores travel to the mammary glands and are then present in the milk. When the milk is made into cheese, during the cheese making process, the spores are activated and while the cheese is aging, the active bacteria release gasses that create little holes throughout the cheese and can sometimes cause a wheel of cheese to blow-up. (I would like to see this happen!) The bacteria are harmless, and very interesting. However, the cows that produce the milk for Parmigiano Reggiano are not allowed to eat silage, therefore no spores in the cheese, and no holes (or "eyes" in industry terms). The very similar cheese, Grana Padano, is made from silage milk, but a natural enzyme is added during the cheese making process to keep the spores dormant. Grana Padano very similar but slightly cheaper than Parmigiano and is typically what you are served at Italian restaurant in the guise of Parmigiano. So next time you are buying real Parmigiano, here is one more reason to beleive that it is in fact the king of cheeses.