This is the first week of summer, so behind the news about new burgers there is also a battle over iced-tea at top burger chains. Like coffee, iced tea is a high-profit-margin item that sounds even tastier to operators when sales and customer growth is hard to come by. In selected markets—including parts of Ohio and New York State—McDonald’s is offering a line of Fruit Tea Fusion drinks under its McCafé umbrella. Burger King added a peach iced tea as well as sweetened and unsweetened iced tea as part of the new menu it introduced in March.