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How do you grill a perfect burger?

I'm a pretty good griller (gas barbeque). I can turn out perfect steaks, fish, duck breasts, and even an entire leg of pork. The one thing that eludes me is the simple burger. Even with lean beef, I get constant flare-ups and greasy black smoke. What's the trick to grilling the perfect burger? (fresh meat, hand pressed, not a recipe question)