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1/2 medium yellow onion, roughly chopped

1 tablespoon chopped garlic

2 (15-ounce) cans black beans, rinsed and drained, divided

2 tablespoons freshly chopped cilantro leaves

2 teaspoons freshly chopped parsley leaves

1 egg

1/2 teaspoon red pepper flakes

1/2 cup bread crumbs

Salt and fresh ground black pepper

4 hamburger rolls

Optional Toppings:

1 tomato, sliced

4 small Romaine lettuce leaves, or any other type you have on hand

1/4 cup ketchup