Combine 1 can of the drained beans, garlic, parsley, cilantro and diced red onion in a large bowl.
Transfer to a food processer and pulse until the mixture is pureed. It does not need to be smooth, a few chunks are fine.
Return the mixture to the bowl and add the remaining beans, the egg, red pepper flakes and seasoned salt.
Combine the mixture using your hands. You want it to be firm enough to form patties, so add breadcrumbs, a little at a time, mixing well until you get the right consistency.
Divide the mixture into 4 parts and form into patties.
Fire up your grill or a large skillet over medium-high heat.
Lightly brush both sides of the patties with the oil. Place on the grill and cook 4-5 minutes or until a nice char is formed.
Flip and cook the other side 4-5 minutes or until a nice char is formed.
Remove from the grill.
Serve on buns, topped with teriyaki sauce, pineapple and red onion slices.