Preheat oven to 425 F. Bake frozen crinkle cut fries on a parchment lined baking sheet for about 12 min per side, or according to package instructions.
Meanwhile, mix all ingredients together under the chicken shawarma heading, then marinate the chicken for 10-15 min or up to 2 days.
Next, prepare veggies and mix ingredients under the garlic sauce heading together in a blender. Optional: if desired, add the garlic sauce to a ziploc bag and then cut a small hole in the corner to drizzle fries with the sauce.
Heat a medium-sized skillet over medium-high heat, then saute the chicken for 7-8 minutes until fully cooked.
In a separate skillet at the same time, heat olive oil over medium-high heat then saute red onion with sumac and salt to taste, cooking for 7-8 minutes until softened.
Remove fries from oven and top with cooked chicken, sauteed onions, pickled turnips/cabbage, diced tomatoes, cucumbers and parsley. Drizzle with garlic sauce or serve it on the side. Enjoy!