mine requires meat grinder and some round steak.
add garlic , onion(powder) , a bit of soy. pepper light on salt.
you may need a binder depending on fat content. if you do. slatines and egg work.
mix and let sit over night.
form patties make sure you leave a dent in the center to compensate for swelling.
grill on hot fire...I usually leave the side down and rotate the burger for good grill marks. flip once... make sure you get a nice caramelization.