Prep: Peel and chop beetroot.
Wet Mix: Blend all roast ingredients except the vital wheat gluten.
Preheat: Preheat oven to 160°C (320°F).
Combine: Pulse wet mix and vital wheat gluten in a food processor until tacky and stringy.
Rest: Rest dough for 10-15 minutes.
Stock: Simmer veggies and herbs in water.
Wrap (Paper): Wrap seitan tightly in baking paper, twisting ends to seal.
Wrap (Cloth): Wrap again in cheesecloth, keeping it tight.
Tie: Tie with string at intervals to maintain shape (see pictures in post).
Cook: Cook in stock for 1 hour, flip, cook 1 more hour.
Roast: Unwrap, add mustard, roast at 200°C (400°F) for 40 minutes.
Gravy: Blend cooking liquid.
Baste: Baste roast every 10 minutes.
Serve: Serve with your favorite sides.