That’s gelatin — flavorless Jello — it’s encased in. One of the top 3 meals I ever had was at a converted 17th-century abbey in England, and part of the meal was rabbit “terrangue” — that’s what I remember it being called, but spellcheck has no idea — which was rabbit in gelatin. One of my roommates in college used to say he wanted meat-flavored Jello. I guess I actually had it.