Chinese cooking has been refined over centuries, with techniques passed down through families, regional kitchens and apprenticeships. Fusion cuisine, by contrast, borrows freely from different traditions to create something new. Some diners worry that one must come at the expense of the other, but many chefs see it differently. After all, in a city where Cantonese, Teochew, Hokkien and Western influences already sit side by side, a Chinese fusion restaurant in Singapore often shows that…