Seitan Shawarma recipe on Second Nature

Name: Seitan Shawarma recipe on Second Nature
Cuisine: Asian, Middle Eastern
Ingredients: 400g; homemade or store bought Seitan; 2 cloves; garlic, minced; cumin powder; coriander powder; cayenne pepper; turmeric powder; 1/2; lemon, juiced; olive oil; 2 cloves; garlic, minced; tahini paste; lemon, juiced; 125mL; cold water; wholemeal pitta breads; 3-4; tomatoes, sliced; small cucumber, sliced; red onion, finely sliced; gem lettuce heads, shredded