Clean the mushrooms using water and towels to remove the grime. Then, using a spoon, scrape out the insides of the mushrooms and toss.

In a large bowl, combine the oil, vinegar and spices. Add the mushrooms to the bowl, and stir well so the mushrooms are covered in the oil mixture. Let set for about 20 minutes and use this time to get your toppings or sides together.

Heat a grill or large frying pan to medium heat, and add the mushrooms, cooking for 5-6 minutes before turning over and cooking a final 5 minutes.

Add your toppings and mushrooms to the burger buns, and serve immediately.