In a large bowl, combine the vital wheat gluten flour (and any optional dry seasonings). If using a stand mixer or food processor, place the flour in the work bowl.
Pour in 3/4 cup (960 ml) of cool water and mix until just absorbed. The dough will form a single, rubbery mass almost immediately.
Knead the dough thoroughly for 5-7 minutes by hand, 2-3 minutes with a stand mixer's dough hook, or about 30-45 seconds in a food processor. The goal is a firm, elastic ball.
Cover the dough with a cloth and let it rest for 20 to 30 minutes. This step is crucial for relaxing the gluten.
While the dough rests, prepare your Dark or Golden Simmering Liquid in a large pot with a tight-fitting lid.
Divide the rested dough into two equal portions. Stretch and roll each portion into a log shape.
Don't worry about making them perfect; they will plump up significantly during cooking.
Bring the simmering liquid to a boil, then carefully place the seitan logs into the pot. It's okay if they aren't fully submerged.
Reduce the heat to maintain a gentle simmer, cover the pot, and cook for 1 hour. Use tongs to turn the logs once or twice during cooking to ensure they cook evenly.
To check for doneness, carefully remove a log and slice a small piece off the end. It should be firm and chewy. If you prefer a less dense texture, return it to the pot and simmer for another 15-30 minutes.
Once cooked to your liking, allow the seitan to cool completely in its simmering liquid. This helps it absorb more flavor and stay moist. Store in the liquid in the refrigerator.
Kneading is non-negotiable. Thoroughly kneading the dough is what develops the gluten strands, creating that signature chewy, meaty texture.
Don't cut this step short!
Don't skip the rest period.
Letting the dough rest for at least 20 minutes after kneading allows the gluten to relax, making the seitan more tender and easier to shape.
Cool it in the broth. Allowing the cooked seitan to cool completely in its simmering liquid is key. It will absorb more of the delicious flavor and prevent it from drying out.