Preheat the oven to 350 degrees Fahrenheit.
Add 1 teaspoon garlic powder, 1 teaspoon onion powder, 1/2 teaspoon ground fennel, 1/2 teaspoon ground sage, 1/2 teaspoon dried rosemary, 1/4 teaspoon black pepper, 1 tablespoon tomato paste, 1/3 cup silken tofu, 2 1/2 tablespoons soy sauce, 1 tablespoon balsamic vinegar, 1 tablespoon olive oil, 1/3 cup beet juice, and 1/4 cup nutritional yeast to a blender.
Blend until smooth.
Transfer that mixture to a large mixing bowl.
Spoon 1 cup vital wheat gluten into a measuring cup (don’t scoop), then add it to the mixing bowl.
Mix with your hands until combined, then knead for 2-3 minutes (I recommend wearing kitchen gloves to avoid staining your hands from the beet juice).
Transfer the dough to a 9x13-inch baking dish (or similar size) lined with parchment paper, then shape it into a rectangle.
Pour 1/3 cup cold water into the baking dish (not directly on the dough).
Cover the baking dish with an oven-safe lid or aluminum foil, then bake for 45 minutes.
Remove the cover, then bake for 10 more minutes.
Brush with extra virgin olive olive before serving, if desired.