Tonkotsu ramen's broth uses babi bones to cook for hours until it becomes milky white and tasty. It is a sinful pleasure that is very haram, forbidden to the 'no pok' folks.
Ippudo's ramen standard dropped a bit after opening several outlets, I was at Ippudo first restaurant launch in Mandarin Gallery. The nihonjin boss and his nihonjin staff were all there.