Foodbme -- Cook's Illustrated magazine, put out by America's Test Kitchen, had an article in their July/August 2008 issue entitled "Reviving the Original Drive-In Burger." It is two pages of information, but the main points are:
1. Grind your own meat, and don't use chuck, use a mixture of sirloin steak tips (for big meaty taste) and boneless short ribs (well-marbled to lend the fat that keeps the burgers juicy". They say use 10 ounces sirloin tips and six ounces beef ribs.
2. Cube them, and chill in freezer until firm but still pliable, then pulse in a food processor.
3. Spread the mixture into a metal baking sheet and divide into four piles. Don't pick it up any more.
4. Then quote: "Without lifting or compressing, gently form meat into thin (and loose) patties with rough edges and textured surface."
5. Season with salt & pepper; then flip with spatula and season other side.
6. Cook in heavy skillet over high heat on one side without moving for three minutes; then flip and cook one minute more, then add cheese if desired and go another minute until cheese melts. Serve on toasted bun.
The reason for partial freezing is so the meat won't get too warm, and therefore prevent "smearing" while being cut in the food processor instead being "cleanly chopped."
Most of their tasters preferred American cheese, as it melted and filled the cracks better than Cheddar or Swiss, and did not compete with other flavors.
They do agre with Boyardee65's remark about Thousand Island Dressing. They make their own version, and say it "proved to be the best foil for the juicy, salty burger." That and the cheese and a little sliced raw onion made the best burger for them.
If you don't have this magazine, maybe your library Does?
By coincidence their sister magazine, Cook's Country, arrived today, and it features that New Mexico treat,the Green Chile Cheeseburger. They call it "...the best burger you never heard of." I guess they never heard of Roadfood.