Hen’s eggs

These are usually sold in boxes of a dozen which can be broken in half to get a half dozen. Eggs are graded for size according to weight per dozen. These are: Jumbo: 30 ounces per dozen; Extra-large: 27 ounces; Large: 24 ounces; Medium: 21 ounces; and Small: 18 ounces. Most cookbook recipes are based on large eggs. Eggs are also graded AA, A and B according to quality. Quality grading is done on the basis of thickness of white, firmness of yolk and size of air cell with AA having the thickest white, a high yolk when broken, and a small air cell. Boxes of prepacked eggs are stamped with the quality grade, size of egg and sometimes with a “sell by” date too.