You don't often see McDonalds serve burgers with mushrooms, but some other International McDonalds do.
There are two burgers in the Mushroom burger series: the Mushroom burger and the Mushroom Deluxe.
Both these burgers have a quarter pounder beef patty inside.
Mushroom burger
The Mushroom burger is the lighter option of the two which is only the maized topped bun itself, a piece of sliced cheese, quarter pounder beef patty and sauce.
Luckily the sauce was really strong and covered the taste of the beef.
The sauce was dark beige and it tasted really tangy with a hint of black pepper.
The grounded black pepper could be visually seen in the sauce.
Mushroom Deluxe:
This is basically the Mushroom burger with a rash of bacon and some lettuce.
It was quite messy to eat because there was a lot of fillings inside.
It does not taste as strong as the Mushroom burger because there is lettuce and a rash of bacon in it as well.
There is less sauce in it too.
I would recommend ordering the Mushroom burger in the Mushroom series if your a Mushroom lover.