Haggis is a form of sausage/ pudding. It's made from oatmeal, onion, suet, salt, pepper, and possibly other spices. The main ingredients are the heart, lungs and liver of a sheep. The offal (known as a pluck) is first boiled then minced, mixed together with the other ingredients and stuffed inside a sheep's stomach and the opening sewn up. The resulting pudding is then boiled for a further period of time. Usually served with mashed potato and turnip. Properly made and cooked a thing of beauty. Wrongly done, a real horror!