Mini Memphis Burgers

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1 medium red onion, sliced

1 pound lean ground beef

1/2 teaspoon onion powder

1/4 teaspoon salt

1/4 teaspoon freshly ground black pepper

12 to 15 small potato rolls, split in 1/2

Mustard sauce, recipe follows

Mustard Sauce:

3 tablespoons mayonnaise

1 tablespoon Dijon mustard

1/2 teaspoon cayenne pepper

Salt and freshly ground black pepper