In a small bowl, whisk together the cumin, coriander, turmeric, garlic powder, salt, and pepper to create the shawarma spice blend.
Heat the olive oil in a large skillet over medium-high heat.
Add the ground beef to the skillet, sprinkling with the spice blend, and cook for 7 to 9 minutes until browned and cooked through, breaking it up with a spatula.
In a separate pan, sauté the cauliflower rice with a splash of water for 5 minutes until tender and slightly golden.
Divide the warm cauliflower rice into a large bowl to create a low-carb base.
Top the cauliflower rice with the spiced beef, diced cucumber, halved cherry tomatoes, and minced red onion.
In a small jar, whisk the tahini and fresh lemon juice with a tablespoon of water until the dressing is smooth and creamy.
Drizzle the tahini sauce over the bowl and garnish with chopped fresh parsley and crumbled feta cheese.