Black Bean Burger

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2 cups black beans, drained and mashed with a fork

1 cup seasoned breadcrumbs

1/4 cup grated onions

1/2 teaspoon chili powder 

1 egg 

Salt and freshly ground black pepper

Canola oil, for oiling grill pan 

1 to 2 kaiser rolls

Arugula, for serving

Sliced tomatoes, for serving

Mayonnaise, for serving