I agree that Chinese in India is basically Indian reinvention of Chinese food but I hate it when overdo it.
Zen is supposed to be one of the best Chinese Restaurant in Delhi and I have had lunch and dinner here for many years now partly due to compulsion. Service is one of the best in Zen. However, the food is mostly hot and spicy with generous usage of red chili and red chili powder. The taste of a food is camouflaged by usage of chilli. When it is used in generous quantities the actual taste of the ingredients cannot be tasted.
Sea food is missing. Prawns are not the only sea food. I would recommend this place purely for its service which makes it ideal for business liaisons.