I tried three different recipes to make soft pretzels or Laugenbrezel, and found one that I really liked. Spoiler: It's the one with caustic soda.
THE HISTORY OF THE PRETZEL - Prop & Peller
How to Make Bavarian Soft Pretzels for Oktoberfest - Beers with Mandy
All the Philadelphia Pretzel History You Need to Know
The Pretzel Co. (8) 10-oz Hand Twisted Monster Size Soft Pretzels
The Twisted History of the Pretzel - Part 3 - More than Beer and Schnitzel
The Twisted History of the Pretzel - Part 1 - More than Beer and Schnitzel
The Twisted History of the Pretzel - Part 3 - More than Beer and Schnitzel
Soft Pretzels with Local Ale Cheese Dip — Under A Tin Roof
The Twisted History of the Pretzel - Part 1 - More than Beer and Schnitzel
10 Best Spots For Pretzels in Greater Philadelphia — Visit Philadelphia
Snyder's of Hanover, Nacho Cheese Twisted Pretzel Sticks, 12-Oz. Bag
Snyder's Of Hanover Seasoned Twisted Pretzel Sticks - 18oz : Target
Food History: Pretzels