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I dug into some notes from Introduction To Baking and Pastry taught by chef Robert Parker (boy every day I had writers cramp this guy talked so fast and taught so much)... Here's the spiel on eggs. Looks like an egg weights 1 1/2 ounces - or 9 eggs equals 2 cups (a pound).
EGGS:
Whites: albumin protein (no fat)
Yolks: whole protein (33% fat)
Shell is pourous, store away from odorous food items (such as
meat, garlic, and fish). Large eggs are the standard used in the pastry
business. Grade AA are the standard used in the pastry business.
Whites weigh about 1 oz., yolks weigh about 2/3 oz.
9 eggs per lb.
24 yolks per lb.
16 whites per lb.
Grading is based on the thickness of yolk (how it stands up),
the size of the white (it's stiffness-not runny), size of the air sack,
and then cleanliness of the coops the chickens are raised in. An
egg producing establishment is given a grading "rating". To protect
against salmonella the eggs are washed (they used to be run through
a clorine solution).
Yolks can be dark or light (the color is based on the chicken's
diet), shell color determined by the breed of the chicken (only). Cook
eggs to 160 degrees for a few seconds, or 140 degrees for three min-
utes to kill salmonella. In recipes using raw eggs use pastuerized eggs that come in plastic containers. Blood spots in yolks are a
harmless blemish that gets into egg before the shell forms.
Smaller eggs are produced by younger hens, larger eggs by
older hens (best eggs), and very large eggs by even older hens (they
are inferior to large eggs. Eggs can sit in stores up to 4 weeks, the
average is 5-10 days. A two week old AA grade egg drops to a A
grade. Don't buy eggs that are sitting in an aisle display, only buy
eggs from the refrigerated areas of the store. BUT, when using eggs
in a recipe you get best results with eggs that are at about room
temperature.