Haggis was a popular meal for the poor, as it was made from cheap leftover parts of a sheep the most common livestock in Scotland. Those parts would otherwise be thrown away. The sausage still is widely available in supermarkets in Scotland. A traditional haggis recipe describes haggis as sheep’s ‘pluck’ (heart, liver and lungs), minced with onion, oatmeal (often lightly toasted), suet, spices such as salt, pepper, coriander, cinnamon, and nutmeg, mixed with stock, and traditionally stuffed inside the sheep’s stomach, which is sewn closed. The haggis is traditionally cooked by boiling (for up to three hours). Haggis should be cooked below water boiling temperature which prevents the risk of bursting.
Commercial haggis is largely made from pig, rather than sheep and is stuffed in artificial casings, rather than stomachs. Cooked Haggis is normally served with Scotch whisky.