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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
3 tablespoons mayonnaise
1 tablespoon Dijon mustard
1/2 teaspoon cayenne pepper
Salt and freshly ground black pepper
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