With regard to the bratwurst - I grew up in Sheboygan, WI. The tradition there, for big gatherings, was to place them in the beer bath after grilling.
Grilling would start about an hour before food service began. By the time the counters opened, those vats would have hundreds of brats swimming around in them, hot and ready to go. Nobody had to wait for the next batch to be done. And they were served 2 per bun, in hard crusted Semmel rolls.
Now if somebody has a recipe for Kranske...........It's smoked (I think), coarse ground, and gets boiled until the fat collects in scalding blisters under the skin. I remember eating them as a child, and getting burned by the flying fat. It was totally worth it.