At the Tewksbury Country Club's Tew-Mac Tavern, you'll find no bags, no preservatives, and certainly no microwaves. "Everything is made with hands," says Tew-Mac's General Manager Bob Leo, "We make our own salad dressing, our own chowder.  We mash potatoes every morning.  We roast Turkeys every day.  To us, it's important that we make our own food." The Tavern's menu ranges from sandwiches to full-course dinners.  Leo says the Tavern's mission is to give diners the chance to enjoy home-cooked comfort food, but with a Tew-Mac twist. "We might serve you a basket of onion rings," Leo says, "but …