Beef Shawarma Fries

Beef Shawarma:

• 1 lb flank steak (455 g)
• 1 tablespoon tahini
• 1 tablespoon yogurt
• 1 teaspoon salt
• ½ teaspoon black pepper
• 1 teaspoon paprika
• 1 teaspoon garlic powder
• 1 teaspoon onion powder
• 1 teaspoon cumin
• 1 ½ teaspoons 7 spice
• 1 dash cinnamon
• 1 tablespoon sumac

Tahini yogurt sauce:

• 2 tablespoons tahini
• 2 tablespoons yogurt
• salt and lemon, to taste
• ¼ cup water (60 mL)

To serve:

• frozen french fry, or 4 large russet potatoes, fried
• onion, rubbed with sumac for garnish
• pickled turnips and parsley, for garnish