My personal favorite, I found a super easy way to make a vegetarian version of shawarma 
Summary
Mushrooms
Olive oil
Mozzarella cheese
Mayo and a hell lot of spices
Pita bread
Garlic & Onion
Chop the onion really finely. Add olive oil in a pan with garlic, when the oil gets hot put the onion in it and let it stir until it gets soft. In the meantime chop the mushrooms into thin slices, put them in a pan with salt and spices (I like ginger, paprika and cumin). When cooked cut the mozzarella cheese, put it in the pita bread with mushrooms and mayo (you can add whatever sauce you like) and put everything in the microwave to melt the mozzarella cheese. Done!