Preheat oven to 400 °F (200 °C).
Heat 2 tablespoons of oil in a large pan over medium heat. Add the onion and sauté until translucent about 2-3 minutes.
Add garlic and sauté until fragrant about 30-60 seconds.
Now add the mushrooms and cook for 10-12 minutes until they have released their water, have reduced in size, are lightly golden and the pan is dry. Stir only occasionally so they have time to brown.
Pour in the soy sauce and stir into the mushrooms. Cook for 30-60 seconds, scraping up any bits on the bottom of the pan. Remove from heat and let cool for a few minutes. Measure out 2 exact cups of mixture (you may have a few tablespoons left over, just save for another recipe or add to toast).
To a food processor, add the 2 cups of mushroom/onion mixture, the remaining 1 tablespoon of oil, water, beans, nutritional yeast, bouillon, Worcestershire sauce, granulated garlic, granulated onion, rosemary, thyme, sage, smoked paprika, and pepper. Process for 2-3 minutes, scraping down sides as needed until everything is broken down and combined. It won't be completely smooth.
To a large mixing bowl, add the vital wheat gluten and the mixture from the food processor, scraping everything out with a spatula. Stir until it just starts to come together (about 30-60 seconds). Now, using your hands, continue to combine while sweeping up all the vital wheat gluten in the bowl (30-60 seconds). Now knead the dough for 5 minutes (no less). The dough should be thick, slightly elastic, and somewhat fibrous looking. (* if your bowl is large enough, you can knead the dough in there, otherwise, knead on a clean flat surface).
Let the dough rest for 5 minutes then knead for 30-60 seconds and shape the dough into a loaf shape about 8 inches long and 3.5" inches wide. Roll the loaf in a piece of parchment paper, then roll in a piece of foil that's about 20" long, and twist the ends like a candy wrapper, securing in place.
Bake for 80 minutes, flipping halfway through. Now remove from oven and allow the roast to sit undisturbed for 20 minutes (no less). Remove from foil and parchment. You can slice and serve now OR prepare the loaf for glazing (next step).
Preheat your oven broiler to the low setting. In a small bowl, combine the brown sugar, oil, and soy sauce until the sugar has dissolved. Now, place the loaf back in the roasting pan and brush the top and sides with the glaze. Broil for 2-3 minutes until you see the glaze start to caramelize. Now brush one more layer on the top and sides and broil for another 2-3 minutes, watching carefully to prevent burning. (*if your broiler doesn't have a low setting, use the high setting and reduce the time. Watch very carefully).