I haven't a clue what you'd use for casing. In any event, you wouldn't eat that part....

What is the point?
Well, as I see it, compromise can bring some pleasant surprises. In my case, I was never a big meat eater and my partner is vegan. I've learned that there are a lot of people out there with serious allergies, so I thought I'd post something alternative. It's not exactly haggis, but it is in the spirit.