Mix the water, peanut butter, tomato paste, Worchester sauce, oil, rice syrup and starch in a beaker. The water should be as cold as possible to prevent clumping. Crush the spices in a mortar, finely chop the dried mushrooms.
Mix the seitan flour, soy granules and all the dry spices, fried onions and sun-dried tomatoes in the food processor. Using the dough hook on low setting (2 of 4), mix in the liquid ingredients, add chopped onions and pressed garlic and stir for 5 minutes or more.
Cut 2 cucumbers and 1/2 beetroot into strips.
Spread the batter in a roasting pan, spread the cucumber and beetroot on top and then shape into a roast.
Bake the roast for 45 minutes at 180 ° C, then add the onion in rings and vegetable stock. Then cover the roast and bake again at 130 ° C for 1 hour.