Christmas spiced duck leg at Tonkotsu

Tonkotsu is a famous ramen chain in London but has never been on my list to go until recently.
I was captivated by the duck leg which brought me there.
Overall, the noodles were similar to those lye noodles (alkaline noodles) and the broth was rather weak even though it was salty enough, it lacked a bone broth flavour.
The duck was quite nice but a bit dry, however I reckon if I dined there when they started serving this Christmas special, then it would have been soft and supple.
It was nice that the ramen was paired with my favourite Swiss chards and I felt that the sesame garnishing was to give it that Asian touch.