Activate the Yeast: In a large mixing bowl, whisk together the yeast and sugar with the warm water. Let the mixture sit for about 1 minute to begin activating the yeast—it may look slightly foamy or cloudy.
Mix the Dough Base: Stir in the melted butter and salt. Add 3 cups (375g) of flour and mix with a wooden spoon (or dough hook if using a stand mixer) until it begins to form a sticky, shaggy dough.
Develop the Dough Texture: Gradually add ¾ cup (94g) more flour and mix until the dough starts pulling away from the bowl and feels slightly tacky but not wet. If needed, incorporate an additional ¼ cup flour (about 31g), a tablespoon at a time, until the dough feels soft yet manageable. Poke it with your finger—if it springs back, you're ready to knead.
Knead Until Smooth: Turn the dough onto a lightly floured surface and knead by hand for 3–5 minutes, or continue using a stand mixer fitted with a dough hook. The dough should be elastic and slightly springy. If it’s sticky while kneading, dust lightly with flour—but avoid over-flouring to keep the dough tender. Use the “windowpane test” to check: stretch a small piece between your fingers. If light passes through without tearing, it’s ready.
Rest the Dough Briefly: Form the dough into a smooth ball and cover it with a clean towel. Let it rest at room temperature for 10 to 30 minutes—this gives the gluten time to relax, making it easier to shape.
Prepare for Shaping: While the dough rests, preheat the oven to 400°F (204°C) and line two baking sheets with silicone mats or parchment paper (greased if using parchment). Begin bringing the 9 cups of water and baking soda to a boil in a large pot.
Divide and Shape Pretzels: Cut the rested dough into 12 equal pieces—each about 75g or roughly ⅓ cup. Roll each piece into a long rope, 20–22 inches in length. Form a large “U,” twist the ends together once or twice, then fold them down to the bottom of the U to create a classic pretzel shape. Press the ends down firmly to hold the shape.
Boil in Baking Soda Bath: Gently place 1–2 pretzels at a time into the boiling baking soda water for 20–30 seconds. Do not exceed 30 seconds, or the pretzels may develop a bitter flavor. Use a slotted spatula to lift each pretzel out, drain excess water, and transfer them to the prepared baking sheets.
Top and Bake: Sprinkle each pretzel generously with coarse salt while still damp. Bake in the preheated oven for 12–15 minutes, or until deep golden brown and glossy.
Serve or Store: Serve warm, ideally with cheese dip or mustard. Store leftovers at room temperature in an airtight container for up to 3 days. To reheat, bake at 350°F (177°C) for about 5 minutes or microwave briefly until warm.