STUNNED McDonald's fans have slammed the new Double Big Mac for a "shameful" lack of a key ingredient.

The huge burger hit restaurants on October 6 and fast food lovers have been racing to try it.

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But some have been left with a bitter taste in their mouths after McDonald's posted a video of the Double Big Mac.

The burger lovers have mocked the chain for including just one slice of cheese for four patties.

One said: "One slice of cheese on four burgers is shameful."

Another wrote: "Hardly a Double Big Mac, could at least throw a second slice of cheese on there."

A third fumed: "Shame there is only one slice of cheese in it, so dry compared to a normal Big Mac."

While one person wrote: "One single little slice of cheese for FOUR PATTIES ?!? YOU'RE MOCKING IT".

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McDonald's unveiled its new limited menu at restaurants across the country on Wednesday.

The Double Big Mac costs £4.19 on its own or £5.69 as a medium meal with a side and a drink.

It features four 100% beef patties, a slice of cheese, lettuce, onion and pickles plus the Big Mac sauce.

Other new items include a Crunchie McFlurry from 99p and Nacho Cheese Wedges from £1.89.

They replace the Big Tasty, Chicken BBQ Smokehouse and Mozzarella Dippers which joined the limited-edition menu back in August.

But the items are only around for six weeks so fans will have to be quick to try them.