Preheat oven to 400°F (205°C). Slice the tops off two garlic heads, drizzle with olive oil and salt, wrap in foil, and roast for 45–60 minutes until golden and soft.
Grate the onion and squeeze out all liquid with paper towel or cheesecloth. In a large bowl, combine beef, minced garlic, spices, parsley, cilantro, and grated onion. Mix with your hands for 2–3 minutes until sticky and well combined.
Spread onto the sheet pan in a ½-inch thick rectangle. Score into 1-inch strips with a knife. Drizzle evenly with 4 tbsp olive oil. Bake for 12–15 minutes at 400°F, then broil 2–5 minutes until golden and crisp on top.
Toss sliced red onion, tomatoes, parsley, salt, pepper, sumac, and lemon juice in a bowl.
Squeeze roasted garlic cloves into a bowl, mash, and mix with Greek yogurt, lemon juice, tahini, water, and spices.
On lavash or pita bread, add sauce, kefta, and salad. Roll tight and crisp the wrap in a lightly oiled skillet.
