Make Spice Paste: In a food processor, blend a can of black beans (with liquid), all spices, soy sauce, and dark soy sauce until completely smooth.
Add Protein Powder: Add pea protein powder to the food processor and pulse briefly to combine.
Form Seitan Dough: Gradually add vital wheat gluten and water in 50g increments, pulsing after each addition. Stop when dough wraps around the blades and becomes slightly fibrous. Adjust water if needed.
Knead and Shape: Knead dough briefly on a clean surface. Divide in half and shape into logs.
Wrap and Steam: Wrap each log tightly in baking paper, then foil. Steam for 1 hour, or until firm.
Cool and Rest: Cool completely, then refrigerate overnight.
Slice and Cook: Shave seitan logs thinly with a knife or peeler. Fry slices in oil until browned.
Build Your Kebab: Enjoy in your favourite kebab with desired toppings!