KATHY: I thought I knew everything there was to know about clay pot rice . . . until my mom and I discovered Lei Garden in Hong Kong’s Central district. When our server lifted the lid, I immediately noticed the cured meats came whole, not sliced up like at many of the dai pong dong joints in Mong Kok, one of the most celebrated street-food rows in the world. The server lifted the meats and choy sum from the rice, sliced them tableside, and plated it beautifully. They drizzl