Cajun Spiced Burgers

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1 1/2 pounds 80% lean ground beef

2 teaspoons Cajun seasoning

3 scallions, sliced (white and green parts)

1/2 cup mayonnaise

2 teaspoons Dijon mustard

1 teaspoon hot sauce

1/4 cup loosely packed fresh flat-leaf parsley leaves, chopped

1 celery stalk, finely chopped (about 1/2 cup)

1 medium yellow onion, sliced into 1/4-inch rounds

1 medium green bell pepper, sliced into 1/4-inch rings

1 tablespoon vegetable oil

4 sesame seed hamburger buns, split