Co-owner Mai Pham cooks up an order at her Howe Avenue La Bou restaurant that includes a small Lemon Grass restaurant. She and her former husband, Trong Nguyen, own both restaurants. "It's a concept that is working well for us," said Nguyen. "We're offering more choice and leveraging the infrastructure." Department stores and grocery outlets are increasingly incorporating ministores and kiosks into their operation to give shoppers more choices on brands.It seems almost counterproductive. A grocery store with shelves of coffee for sale offers a Peet's Coffee & Tea stand selling fresh-brewed java and coffee beans. A department store with yards of makeup counters installs a ministore selling handmade soap and natural cosmetics. Turns out, the more the merrier.