Dear Burger King

Welcome to Beijing. 

I'm glad you're here, but it seems that you forgot to bring something very important with you:  MUSTARD!.  Last night at your outlet in Terminal 3 of the Beijing Airport, I asked for extra mustard to be added to my hamburger.  I was told, quite matter-of-factly, "we don't have mustard." 

Come come.  Even your red and yellow competitors (who have been here since 1994) managed to show up with mustard. 

And it's not like mustard is or would be foreign to Chinese taste buds.  Mustard is a commonly used cooking spice (albeit not necessarily in the form of a bright yellow sauce). 

So please, airlift in some mustard right away.

After all, a hamburger without mustard has no meaning.