You're right, using the salt trick the is mortar not necessary.
In Venezuela is commonly used the pig's trotters for lentils, beans, etc. I hope you try it out, I promise it 'll be great!
Your book looks intriguing...! I'd like to have a look at this Viennese pearls 😋
Thank you for your time and your comment.
BTW: Die Deutsche Version dieses Beitrags ist jetzt auch erreichbar! 🤩
Pigs Trotters: yes, they are often used here in Vienna also - from Czech and Hungarian tradition mostly.
About the cookbook: I had translated (and altered them my way) some of the recipes for my friends. Most recently for my ex wife (she still doesn't know how to cook, lol) Goulash, Paprika Chicken and Rouladen Recipe - on my Google Drive.
Somewhere in my files I have scans of all the pages, but can't find it right now, which makes me think, if I do find them, I should just publish them on scribd.
The cookbook is not easily found - no hits on Amazon (sold out), but seen some on Abe Books: Perlen der Wiener Küche and on ebay from Germany, with a few others by Franz Ruhm.
About those recipes I was looking for: I found them, they were scanned JPG pages. I just now uploaded them to Flickr, so you can check them out on there:
https://www.flickr.com/photos/artofthemystic/albums/72157675398970587