A new take on the iconic Steak Oscar. Here, the crab becomes the base and top for the juicy burger. Of course there must be asparagus and hollandaise to maintain the Oscar status.
In a medium mixing bowl, beat egg with a fork. Add mayonnaise, salt, and mustard and breadcrumbs and blend well. Fold in the crabmeat and cooled onion and pepper mixture. Refrigerate for at least 3 hours or up to a day.
Heat the butter until it is very hot in a covered glass measuring cup or small saucepan.
While the blender of food processor is steadily running, slowly dribble the hot butter through the top opening until the sauce is very smooth. Transfer the sauce to a double boiler or a bowl set in very slowly simmering water. Do not let the hollandaise get too hot or it will curdle.
When you are ready to cook, spread the twelve slider bun halves evenly with the crab mixture (about a heaping tablespoon per bun side).