These could be made with ground turkey or chicken as well. The addition of the onions, breadcrumb, ketchup and teriyaki keeps them moist and flavorful.
Substitute soy sauce for the Teriyaki sauce.
We like to use a hinged basket, lightly oiled for burgers. It makes them easy to turn. A non-stick grill mat is also a good – or just directly on the grill. You could even fry them in a skillet.
Find it online: https://thymeforcookingblog.com/2022/06/teriyaki-burgers/