Cut the fillets into thin slices and mix them with oil, spices, and sambal oelek, let marinate for 30 min or more.
Tzatziki
Halve the cucumbers lengthwise and scrape out the seeds. Grate the cucumbers on the coarse side of the grater and press out all the liquid, possibly through a sieve.
Mix the grated cucumbers with yogurt and garlic, and season with salt and pepper.
Now you can warm the bread and fry the chicken pieces in a pan – cook until they are lightly browned and cooked through.
Fill the bread with salad, chicken, tzatziki, and tomato – serve.