What is pumpernickel?!
Answers: check this out
Pumpernickel is a type of German bread traditionally made with rye meal. It is now often made with a combination of rye flour and whole rye berries.
No answer here - but take a look in Wikipedia, where there is an excellent (but long) explanation of pumpernickel - its origins, ingredients, variants, and more
A really lovely, dark rye bread, and it makes the best rueben sandwiches ever.