INGREDIENTS
•
Cooking spray
•
1/2 cup chopped onion
•
6 tablespoons ketchup, divided
•
1/2 cup panko (Japanese breadcrumbs)
•
1/4 cup chopped fresh flat-leaf parsley
•
1 teaspoon Worcestershire sauce
•
3/4 teaspoon dried oregano
•
1/4 teaspoon salt
•
1/4 teaspoon freshly ground black pepper
•
1 pound ground sirloin
•
1 large egg white