Haslet, also spelt 'Acelet', is a pork meatloaf with herbs originally from Lincolnshire, England. The name is derived from the Old French hastilles meaning entrails [1].
In Lincolnshire, haslet (pronounced hayzleht locally), is a meatloaf typically made from stale white bread, ground pork, sage, salt and black pepper.[2] It is typically served cold with pickles and salad, or as a sandwich filling.
Welsh haslet is traditionally made from finely minced potatoes, pigs' liver and onions.[3][4]
In England, it is commonly sold on a delicatessen counter. In the south, a meatloaf containing the cooked inner organs of a pig, such as the heart, kidney, liver and lungs, is called haslet, or haslet hash.
http://oxforddictionaries.com/definition/haslet