I may have found the perfect solution to the “rød grød med fløde” question (non-danophones… this is pronounced “chruuu gchruuu merl fluuluheh” and is apparently The Perfect Way to greet a new speaker of Danish. “NOW SAY IT FASTER AHAHAHHAHA”)
When Danes ask me to repeat something in Danish, with a view to making fun of the way I pronounce it, I speak after them really slowly as if *trying* to match their pronunciation but say “Chron… my…. eeee…. ruuuuu’en”. I also do it quietly because what I am saying is incredibly rude. I also look confused and surprised at their reaction as if it were an honest mishearing.