Heat oil in a medium sized skillet over medium heat.
Add in onions and cook, stirring frequently for about 5 minutes.
Then add in garlic and cauliflower rice. Season generously with salt, pepper, and a bit of the sumac. Turn heat up to medium high, and cook, stirring regularly, until lightly browned - about 4-5 minutes.
Stir in fresh lemon juice, then transfer to serving plate. Sprinkle with remaining sumac, and top with fresh parsley.