This awesome sandwich is reminiscent of the famous Maine Lobster Roll, and made with ingredients that are easy to find.
In a medium bowl, flake the crabmeat, and mix in mayonnaise, onion, lemon juice and Old Bay seasoning. Cover and refrigerate for 30 minutes to allow the flavors to mingle.
Spread butter on the inside of the hot dog buns, and toast under the broiler. Fill buns with the crab salad, and serve.