Add onion and garlic to a food processor and process until minced.
Add meats, breadcrumbs, herbs and spices. Process until just combined and meat is broken down. Texture should be sticky.
Measure meat mixture into 6 balls (about 175g each) and shape each ball into an oblong/oval shaped patty.
.Preheat grill on high. Inside temp should reach 450-500F/230-260C. (alternately you can cook these under a medium broiler if you don't have access to a grill but keep a close eye on them to be sure they don't burn)
Clean and oil grill grates. Spray or brush oil on meat patties then place them on the grill to cook for 4-5min, lid closed.
After 4-5min, flip to side 2, lower lid and grill for 3-4 more minutes.
When done, internal temp should be at 150F/63-65C. Allow meat to rest for 5 min.
Slice meat into pieces similar to the size of gyro meat.