The best burger I've ever had is the Grilled California Avocado B-L-T Burgers with Caramelized Chipotle Onions.  Don't let the "California" scare you, it's really a good burger.  It won Grand Prize in a 2004 Best Burger contest.  Get the recipe at foodnetwork.com.

One shortcut that helps is to use this garlic cheese spread.  Especially good if your burger eaters don't care for blue cheese.

The carmelized chipotle onions really make this burger--they're worth the effort.

Andi likes this burger too.  Someday maybe Elissa will as well.