Burger San Marcos – Back Alley Grill. Back Alley Grill is a burger joint located in San Marcos CA. We offer a variety of dishes, burgers and vegetarian dishes and salads. Our theme is burger in paradise. You can come and relax, enjoy a beer and try our fresh and tasty foods. We are now open for lunch and dinner Tuesday – Saturday in San Marcos, CA. We offer affordable meals for everyone at our restaurant. We offers a friendly ‘Burger in Paradise’ theme, serving Certified Angus Beef burgers, pulled pork, chicken sandwiches, salads, and other signature foods.