McDonald's Corp. will swap burgers for potato sandwiches when it opens two vegetarian restaurants in India next year, the first such outlets globally for the world’s biggest restaurant chain.  The attempt to draw religious Indians shows how the Oak Brook, Illinois-based company is trying to boost sales by appealing to local tastes outside its home market.  The vegetarian restaurants will sell items such as the McAloo Tikki burger, a sandwich with a mashed-potato patty, and the Pizza McPuff, a vegetable and cheese pastry.  A note to my travel agent:  cross India off my destination list.