Make the hummus by blending the chickpeas, lemon juice, jalapeño, salt, and tahini.
Season the chicken with the shawarma seasoning.
Make the garlic sauce by blending the garlic, lemon juice, salt, and grape seed oil.
Assemble the cake by layering the pita bread, hummus, chicken, pickled turnips, and garlic sauce.
Garnish with chopped parsley and paprika.