Place an empty baking sheet on the bottom rack of the oven (you want it to get nice and hot).
Once the oven is hot and the pretzels have been in the fridge for an hour, it's time for the lye bath. Refer to the tips section earlier in the blog post for all the information and precautions when working with lye! Most importantly, wear gloves, eye protection, work in a well ventilated space, use a glass or stainless steel bowl, and add the lye into the water, not the other way around.
In a large glass bowl, add in 1 liter of water. Sprinkle with 37 grams of food grade lye. Use a stainless steel slotted spoon to stir it until the water becomes clear again. This is when the majority of the fumes will be released so I recommend being close to the window or even outside for this part.
Take the pretzels out of the fridge and remove the plastic wrap.
Place one pretzel at a time, ideally with the top (the side with the tails pressed in) face down into the lye bath. The tails, may come unstuck but that's ok just be gentle. Leave it to float for 15 seconds. Then, use a slotted spoon and another stainless steel tool to carefully flip the pretzel over. Leave it to float for another 15 seconds.
Carefully lift the pretzel out of the lye bath with the two stainless steel tools. Allow the excess lye bath to drip off.
Place the pretzel back on the parchment lined baking sheet and repeat with the remaining pretzels.
Be intentional about where you place the pretzels because they are hard to move once on the parchment paper.