Chicken Shawarma Salad

Name: Chicken Shawarma Salad
Ingredients: 0.66666668653488 cup extra-virgin olive oil; 0.5 cup freshly squeezed lemon juice; 2 teaspoons ground cumin; 2 teaspoons ground coriander; 2 teaspoons ground cardamom; 1.5 teaspoons smoked paprika; 1 teaspoon ground turmeric; 1 teaspoon cayenne pepper, or to taste; 1 teaspoon salt, or to taste; 1 clove garlic, minced; 4 (4 ounce) boneless, skinless chicken thighs; 0.25 cup tahini; 3 tablespoons honey, or to taste; cooking spray; 1 medium onion, sliced into 1/2-inch rings; 6 cups chopped romaine lettuce; 2 medium tomatoes, sliced; 1 medium cucumber, sliced