Add all of the turkey ingredients, except the vital wheat gluten and water, to a blender or food processor (tofu, onion, garlic, sage and onion stuffing mix, chicken stock cubes, tahini, olive oil, nutritional yeast, onion powder, sage) and blend. Scrape down the sides as needed.
Add the water 1/4 cup at a time - the final amount needed will depend on the water content of your tofu. The final consistencyshould be a fairly thick paste, like hummus.
Add the vital wheat gluten and blend on a low speed until a dough ball forms. The dough ball should have the consistency of play-dough if you've got the water right.
If your dough looks a bit too wet, just add more gluten 1 tablespoon at a time until it forms the desired consistency. If too dry, add water slowly until it reaches the desired consistency.
Blend for a few more minutes to knead the dough. When you can see strands of gluten forming in the dough, stop blending.
Tip the dough out onto a clean work surface and shape into a turkey shape or just an even log if you prefer.
Cover with plastic wrap and let rest for 30 minutes.