01 -  In a large mixing bowl, dissolve granulated sugar in warm water, then sprinkle active dry yeast over the surface. Allow to stand until the mixture becomes foamy, about 5 minutes. 
 02 -  Add melted unsalted butter and fine sea salt to the bowl. Gradually incorporate bread flour, mixing to form a shaggy dough. 
 03 -  Transfer the dough to a lightly floured surface and knead by hand until smooth and elastic, approximately 7 to 10 minutes. 
 04 -  Place the kneaded dough in a lightly oiled bowl, cover, and leave to rise in a warm area until doubled in volume, about 1 hour. 
 05 -  Preheat oven to 450°F. Line two baking sheets with parchment paper. 
 06 -  Punch down the risen dough and divide into 8 equal pieces. Roll each into a rope about 20 inches long, then form each into a fisherman's knot by looping, crossing, and tucking the ends through to shape securely. 
 07 -  In a large saucepan, bring 8 cups of water and baking soda to a gentle simmer. 
 08 -  Carefully lower each shaped pretzel into the simmering baking soda bath for 30 seconds, then lift out with a slotted spatula and transfer to the lined baking sheets. 
 09 -  Brush pretzels with melted butter if desired and sprinkle evenly with flaky sea salt. 
 10 -  Bake in preheated oven for 12 to 15 minutes or until golden brown. Transfer baked pretzels to a rack to cool slightly before serving.