Haggis is a savoury pudding containing sheep's pluck, minced with onion, oatmeal, suet, spices, and salt, mixed with stock, and cooked while traditionally encased in the animal's stomach though now often in an artificial casing instead.
In 1971, it became illegal to import haggis into the US from the UK due to a ban on food containing sheep lung, which constitutes 10-15% of the traditional recipe.
Can haggis be prepared without animal products? That seems to be a tough proposition. Here are some ideas:
Vegetarian haggis: This recipe (explained in this video) is largely Whole Food Plant-Based (WFPB); the only step that uses an animal product is sauteing onions, carrots and mushrooms in butter. Can this step be done in another way so that the overall recipe is WFPB?