Sweetbreads

Food in England by Dorothy Hartley, p. 111

"The pig's sweetbreads usually form part of the mixed dish known as pig's fry.
" There are three different breads: the heart, throat and pancreas. Being white meat they are considered suitable for invalids.

1. First blanch them, by soaking in salted water for an hour, 
2. then put into fresh cold salted water (or milk or mild stock) and bring to the boil as slowly as possible. 
3. Drain, clear of any skin or gristle, and slice fairly thickly. They should now be as white as a piece of bread. 
4. They can be egg-and-crumbled and fried, or served in a number of ways, but for invalids this is perhaps the best."