Remove the cold dough from the refrigerator and let it rest at room temperature for 45 minutes. This allows the dough to warm up enough to be pliable for rolling.
Turn the dough out onto a clean work surface. Eyeball dividing the dough if you prefer. If you want to be more precise, divide into 8 to 10 equal portions (80 to 100g each). But really eyeballing works just fine.
Working with one portion at a time and keeping the others covered, roll each piece into a rope about 12 to 18 inches long and roughly 3/4 inch thick.
Using kitchen scissors or a bench scraper, cut each rope into 1/2 - 1 inch pieces. If you find resistance when rolling, cover and let rest for 15 minutes and then continue to roll out.
Transfer the cut nuggets to parchment lined baking sheets as you go. Keep them covered with plastic wrap.
Let the shaped nuggets rest at room temperature, covered, for 30 minutes. This allows the gluten to fully relax.
Place the baking sheets in the refrigerator, uncovered, for 30 to 45 minutes. This develops a slightly dry skin on the outside of each nugget.
Preheat your oven to 425°F.
Bring 2 quarts of water to a boil in a large pot. Add the baking soda and brown sugar (if using). Stir to dissolve, then reduce to a gentle simmer. The water will turn brownish amber in color.
Working in batches of 20 to 25 nuggets at a time, carefully drop the cold nuggets into the simmering baking soda bath. Boil for 30 seconds total, flipping halfway through with a slotted spoon.
Remove the nuggets with the slotted spoon and put them on a cooling rack that you sprayed with oil (avocado or olive) to help with non stick. Immediately sprinkle the boiled nuggets with coarse salt while they are still wet.
Once finished with all the nuggets transfer them to a parchment lined baking sheet.
Bake for 12 to 15 minutes, rotating the pans halfway through, until the nuggets are deep golden brown.
Remove from the oven and brush with melted butter if desired. Serve warm.