Concealed kong

The Mahjong Lair at Dragon Well (Marina)

RESTAURANTS • FOUND Table

The Backstory: Mahjong is all the rage at the Bay, filling restaurants with the sound of clacking tiles. At Mahjong Monday at Mamahuhu, you can grab a set from the counter, and at the new 13 Orphans in Oakland, there’s a hidden den for open play. But as someone completely new to the game, the clearest introduction I found came a…