Sandwiches have a long history, so any ingredient that you can think of (or can't think of) was probably used as a vintage sandwich topping at one point.
Beef tongue sandwich: oh, I like how this sounds like. Typically I eat beef tongue in tomato sauce with peas, siding a potato mash; might as well sub the carb with bread to see how it turns out.
Livermush sandwich: liver pate is delicious, so I’d be tempted to try it, but to be honest I don’t like the idea of mixing cornmeal with the liver to make it into some sort of loaf.
Beef tongue sandwich: oh, I like how this sounds like. Typically I eat beef tongue in tomato sauce with peas, siding a potato mash; might as well sub the carb with bread to see how it turns out.
Livermush sandwich: liver pate is delicious, so I’d be tempted to try it, but to be honest I don’t like the idea of mixing cornmeal with the liver to make it into some sort of loaf.
Find a deli that carries blood and tongue sausage. Get them to slice it thin, it’s delicious in sandwiches.
Zungenwurst? I ate it once. It’s delicious, but really hard to find where I live.