The finished recipe. Seitan Gyros with Tzatziki and PittaIngredients 1 to 6. 120 g Seitan, sliced thin (Seitan is wheat gluten. It is the one protein here that is nothing but the allergen.). 1 pitta, about 60 g Wholemeal pitta. 40 g Tzatziki. 100 g Tomato. 40 g Red onion. 40 g Little gem lettuceIngredients 7 to 11. 5 g Olive oil. 1 clove, about 3 g Garlic. 1 tsp Dried oregano. Half a teaspoon Smoked paprika. A squeeze Lemon juiceStep 1. Toss the seitan with the oil, crushed garlic, oregano, paprika and a pinch of salt.Step 2. Fry it in a hot pan for five minutes, turning, until the thin edges go crisp and dark.Step 3. Warm the pitta in the pan or a toaster and split it open.Step 4. Fill with the shredded lettuce, sliced tomato and onion, the seitan, the tzatziki and a squeeze of lemon.