Bahn Mi sandwiches are already a fusion food. The baguette and pate come from the French, who colonized Vietnam. And the meat, pickled veggies and cilantro are signature Vietnamese foods. In Southern California, Bahn Mi sandwiches are put through yet another fusion filter - chefs are putting their own spin on the Vietnamese staple, and that’s good news for the regions’ taste buds. Katherine Spiers shares some of her favorites.