Larkburger was the invention of area dining expert Thomas Salamunovich, owner and chef of the highly-rated Larkspur Restaurant in Vail. It's worth the (short) trip from Beaver Creek, and definitely worth the wait in line.
The burgers ($5.75-$6.25) are tasty morsels of Coleman Natural Beef, with just the right amount of fixings, including a superb oniony-garlicky "secret sauce." The fries are Idaho Russets cooked in canola oil and shaken with Parmesan and parsley. Splurge on yourself and go all-out with the Truffle Burger; it's rich enough for the rest of the day, but excellent. If you're counting carbs or calories, they'll wrap burgers in lettuce or substitute fresh edamame for fries.
Diners can feel good about Larkburger because everything comes packaged in biodegradable wrapping and they use energy-efficient commercial cooking equipment--and because portions of sales go to replenish timber forests.