Answer:
Haggis a dish which has its origins in an impoverished peasant society where nothing,least of all meat protein, was wasted. Its ingredients sheep heart, lungs and liver were perishable and in richer societies might have been thrown away. Mixed with oatmeal and packed into the sheep's stomach and boiled it could be preserved for slightly longer although this was not the prime concern. The main idea was to render something cheap into an appetising and nutritious dish. It has been made in Scotland for centuries.