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Memphis Blues Burgers with Mustard Sauce

1 small red onion, cut into 1/4-inch slices
1 pound ground beef
1/2 small onion, grated
1/4 teaspoon salt
1/2 teaspoon freshly ground black pepper
8 small potato rolls, split in half
2 medium-sized ripe tomatoes, sliced
Sliced pickles, for garnish
Leaf lettuce, for garnish
1 recipe Mustard Sauce (see below)
3 tablespoons mayonnaise
1 tablespoon Dijon mustard
1 teaspoon apple-cider vinegar
1/4 teaspoon cayenne pepper
Kosher salt
Freshly ground black pepper


FOR THE BURGERS: Preheat a flat-top grill pan to high. Place the sliced onion on the grill, and cook until lightly charred and tender, about 10 minutes. In a medium bowl, combine the ground beef, grated onion, salt, and pepper. Make eight small burgers equal in size, about 3 inches across. Cook the burgers on the flat-top for 3 to 4 minutes on each side. Serve on the split rolls with grilled onions, tomatoes, pickles, and Mustard Sauce. FOR THE MUSTARD SAUCE: Stir all the ingredients together in a small mixing bowl.

Source: www.cookstr.com