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There's only one thing as satisfying as fries with ketchup - and that's fries with mayo.

But if you've ever headed to McDonald's with a bit of a hangover looking forward to a large serving of fries with lashings of the white stuff, you'll know the devastation of learning that mayo just isn't something McDonald's do.

The chain will give you ketchup, mustard and a variety of other sauces - but one condiment is conspicuous by its absence.

And there's a reason.

(Image: Daily Mirror)

Cosmopolitan asked the fast-food giant the reason it didn't serve mayonnaise, as noted by the Birmingham Mail .

And the reason, says McDonald's, is that there is simply not enough demand for the delicious dressing.

A spokesperson said: "What we offer in our restaurants is based on customer demand. We don’t currently have any plans for mayonnaise to be made available."

(Image: Creative Commons)

McDonald's is launching a Valentine's Day meal this year - charging £20 for three courses.

Revealing all on Facebook, McDonald’s posted: "Book a table for you and your loved one this McValentine’s Day right here, we are going all out providing the most romantic dining experience in history.

"We are offering three courses of McValentine’s perfection for £20 per couple.

"Email us to look at our menu or to book your table now to avoid destroying your chances of real 'couple goals' this McValentine’s Day."