Heat a non-stick pan over medium-high heat. Add the rinsed jackfruit, 1/4 cup barbecue sauce, and 1/4 cup water. Lower heat, cover and simmer, stirring every few minutes and mashing jackfruit with a spatula or fork, until jackfruit is tender about 10 minutes. Remove cover and mash jackfruit, allowing water to evaporate. If any large or tough pieces of jackfruit remain, put them on a cutting board and chop with a knife. Allow the jackfruit to cool completely.
Preheat oven to 375F. Oil a 8x8 or 9x9-inch Pyrex baking dish.
Combine the vital wheat gluten and all the dry ingredients in a large mixing bowl and stir well. Add the water, soy sauce, and cooled jackfruit. Stir or knead well until all ingredients are evenly distributed and all wheat gluten is absorbed. If there is not enough moisture, add one or two tablespoons of water, no more.
Spread the mixture evenly in the prepared baking pan. Bake for 30 minutes. Remove from oven. Use a knife to loosen the seitan along the edges of the pan. Spread barbecue sauce evenly over the top and flip over in the pan. (It's easiest to do this if you divide the seitan in half first and flip one half at a time.) Coat the top with barbecue sauce and return to the oven. Bake for 15-20 more minutes, until ribs are firm and cooked in the middle but not hardening along the edges.
Cut into 16 "ribs" and serve with additional barbecue sauce.
Make sure you buy young green jackfruit in water or brine, not sweetened jackfruit. You can find it in 20-ounce cans in Asian grocery stores for about $1.50 per can. I find that a 20-ounce can yields 10 ounces of jackfruit once it is drained.Brands of jackfruit vary. Some can contain pieces that are tougher than others and may require additional cooking time or even chopping with a knife. Of the brands I've tried, I have found Chaokoh to have the most tender jackfruit.*Calories, sugar, sodium, as well as other nutritional data will depend on the exact brand of barbecue sauce used.