Place the cabbage strips in a colander and pour over boiling water. Drain.
Fry the onion until golden brown. Add the cabbage and fry, stirring, for about 5 minutes. Add the spices and stir well. Add 3 tablespoons of water and fry for another minute or two.
Place the shawarma on a bed of tahini sauce, drizzle with tahini paste, garnish with chopped parsley and pine nuts, and scoop with pita bread!