Chicken Shawarma Salad
1 clove garlic, minced 1 medium cucumber, sliced 1 medium onion, sliced into 1/2-inch rings 1 teaspoon cayenne pepper, or to taste 1 teaspoon ground turmeric 1 teaspoon salt, or to taste 1 ½ teaspoons smoked paprika 2 medium tomatoes, sliced 2 teaspoons ground cardamom 2 teaspoons ground coriander 2 teaspoons ground cumin 3 tablespoons honey, or to taste 4 (4 ounce) boneless, skinless chicken thighs 6 cups chopped romaine lettuce cooking spray ¼ cup tahini ½ cup freshly squeezed lemon juice ⅔ cup extra-virgin olive oil