Egg noodles are made of a mixture of egg and flour. Scotch eggs made with black pudding, such as the "Manchester egg", have become common. This is baked with a topping of egg and milk. Cadbury for its Dairy Milk and Creme Egg. He then sees a chicken laying an egg. Antigens are also injected into chickens for generation of polyclonal antibodies in egg yolk. Examples include pasteurised fresh milk, packed egg and ham sandwiches, etc. Today it is a torilla filled with cooked egg and squash seed salsa. Sponge cakes used beaten egg whites for leavening. There are options to add an egg or side bacon. Each embryo develops in its own egg. The great majority of laying birds used for egg production are chickens. This is used when sperm has difficulty penetrating the egg. It may instead be an aberrant ostrich egg. The book starts with a description of development of the hen's egg.