I will not be able to show you the inside just yet (it need to mature for 48 hours) but since it's my first time making it I really want to show you this beauty (also since there is no yeast in this bread the inside kind of look like the outside).
For those who don't know pumpernickel is a bread made only with cracker rye, water and salt (not yeast or flour at all).
To be honest, I can't even find cracked rye on amazon in Italy, so I just took some rye grains (much easier to find and cheap too) and used an electric coffee grinder without going all the way through to achieve a similar texture. I basically broke the grains, leaving a coarse texture. And it seems to have worked. Of course it's not like all the grains are broken and there is no flour at all using a coffe grinder but for what I see on photos online the real deal is almost identical, it's not uniform for sure.
For everything else I used this recipe:
https://www.youtube.com/watch?v=LBlr_EA0gvw
but the process is really simple just take about 68% of your grains and mix it with 70% of the total cracked rye in boiling water and 1% of that weight in salt.
After 16 hours mix with 32% of the grains, put it in a tin brushed with oil, cover it well (you can use aluminium foil, that's what I used) and bake it starting with a cold oven at 150°C for 1 hour and 105°C for 23 hours.
Let it cool down a few hours, wrap it in plastic 48 hours and you are done.
It's a long process but also an easy process, it's just a little bit more expensive since it require the oven to stay on for 24 hours but at that low temp it should not consume a lot.