Most Hong Kong restaurants have made the switch to green alternatives since a ban on single-use plastics came into force last month. And while some have complained of extra costs, others have found unexpected savings in ditching disposable tableware. Under the first phase of the ban, which officially took effect on October 22 after a six-month grace period, all styrofoam tableware, as well as plastic straws, stirrers, forks, knives, spoons and plates are banned. Plastic cups and food containers may still be sold and used for takeaways but cannot be distributed for dine-in purposes. While many …