By putting meat in cold water and allowing water to heat gradually, a large amount of juice is extracted and meat is tasteless; and by long cooking the connective tissues are softened and dissolved, which gives to the stock when cold a jelly-like consistency. This principle applies to soup-making.
By putting meat in boiling water, allowing the water to boil for a few minutes, then lowering the temperature, juices in the outer surface are quickly coagulated, and the inner juices are prevented from escaping. This principle applies where nutriment and flavor is desired in meat. Examples: Boiled mutton, fowl.