Look how gorgeous, how tempting, this burger is. Who can resist it (though it's a 600-calorie monster)? Wendy's minces no words: The burger is "1/4 pound of our hot and juicy beef, crisp bacon, two slices of American cheese and rich portabellas in a melty cheddar sauce now on our new, buttery brioche bun." Life is short. Enjoy this burger while it lasts (it's a limited-time offering).