Grate the onions into a mesh strainer. Press pulp into the strainer to remove juices. Place the pulp into a cheesecloth and press until the juices stop flowing.
In a mixing bowl, add beef, green onion and onion pulp and combine. Mix in baking powder, salt, pepper, sumac, and turmeric. Add eggs and mix thoroughly. Cover with plastic wrap, refrigerate for 30 minutes.
Get the RecTeq and GrillGrates rolling for about 450 degrees. Spray the grates with Pam Grill Spray.
Shape into two logs and pierce with two skewers (stability, prevent from spinning).
Place on the GrillGrates, rotate every 2 minutes, until evenly cooked and IT 160F