1 cup (240 ml) vital wheat gluten
1.25 oz (35g) package seasoning mix of your choice*
1/2 cup (120 ml) barbeque sauce
1/4 (60 ml) cup water
*I've used taco, chili & sloppy joe seasonings. Package weight varies slightly between brand and variety.
Heat oven to 350 F.
In a medium bowl, combine vital wheat gluten and package of seasoning mix (about 1/4 cup). In a measuring cup, combine barbeque sauce and water. Pour the liquid mixture into the dry mixture and stir/knead until it forms a ball. Spread seitan in a lightly oiled 8"x8" or smaller pan (you could also use a loaf pan) and bake for 25 minutes.
Once cool, transfer to a cutting board and cut seitan into strips.
Source of recipe: I wanted to make Susan V's BBQ Ribz at http://blog.fatfreevegan.com/2007/05/barbecued-seitan-ribz.html  but didn't have the ingredients, so I made these with what I had on hand and liked the result.