Burger King, the second largest fast-food hamburger chain, is taking aim at McDonald's with a new burger that will compete directly with McDonald's 29-year-old Big Mac.

Burger King's new "Big King" sandwich - which has more beef and less bread than the Big Mac - will make its debut in the US over the Labor Day weekend. Burger King, which is owned by Britain's Grand Metropolitan, said it would sell the "Big King" for 99 cents until September 14th.