You've covered dairy and acid ingredients, but I honestly have no idea what "Unrendered Berkshire pork fat" is or where I would get it. Is that bacon grease? Saltpork? Lard is common but rendered.
Thanks! It's entire chunks of fat from a Berkshire pig. Lard works too and is what you get when you render pork fat, but the rendering removes some flavor. I'll update the recipe.
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Probably suet, which is raw and found around kidneys and loins.