Humans have been eating beef since prehistoric times and for good reason. Pound for pound, beef is one of the best sources of high-quality protein and nutrients. It’s also the third most widely-eaten meat in the world, accounting for about 25% of modern meat production, after pork and poultry.  I love beef. It’s such a straightforward and simple food to cook.   Though you can get fancy with it, if you want to, all you really need is a little salt and heat to create one of the most delicious foods on the planet. Loaded with health-promoting amino acids, and it’s one of the single biggest sources of protein in the human diet.  How much to serve:I recommend 8oz (½ lb) per “average” person, or ¾ lb (12 oz) for big and lovers of leftovers.  Some Definitions:  Grass-Fed “Grass-fed” beef refers to cattle that were allowed to graze for their own fresh forage, possibly supplemented with some alfalfa during the winter, providing the closest approximation to the animal’s natural diet.  Grains, which are much…