Add canola oil to a pan and sautée your chopped onion and garlic until soft. Add the fennel seeds, thyme, sage, and basil. Let it cook for another minute.
Using your immersion hand blender or food processor, add the chickpeas, onion-garlic-spices mixture, tomato paste, salt, smoked paprika, soy sauce, and sparkling water. Pulse until it’s saucy.
Add the vital wheat gluten flour and pulse again until it comes together in a ball. (Since gluten flour is so fine, I like to mix it in a quarter cup at a time. This keeps your flour from flying into the air and making a mess).
You should now have a somewhat sticky dough. Divide it into 4 equal chunks. Roll each seitan chunk into a sausage shape, then roll each sausage tightly in aluminum foil. (you can use a layer of parchment paper between the sausage and foil, but this is personal preference). Twist the ends so that the seitan is completely covered in foil.
Fill a large pot with a couple of inches of water and place a steam basket in it. Make sure the water does not go past the steam basket or your sausages will get wet! Bring it to high heat.
Place the seitan sausages into the steaming basket. Try not to stack them, but a bit of overlap is okay. Let them steam for about 40 minutes, flipping them after 20 minutes.
Remove them from the foil and parchment paper (they will be hot)!
Set aside (you will pan fry them with your vegetables).