CHICKEN SHAWARMA

Name: CHICKEN SHAWARMA
Ingredients: * 1 tablespoon ground coriander; * 1 tablespoon ground cumin; * 1 tablespoon ground cardamom; * 1 tablespoon chili powder; * 1 teaspoon smoked paprika; * 1 tablespoon grill seasoning; * Juice of 1 lemon, divided; * 1 large cloves garlic, grated or finely chopped; * 5 tablespoons extra-virgin olive oil (EVOO), divided; * 4 boneless, skinless chicken breasts (about 6 to 8 ounces each); * 1 large onion, sliced; * 1 red bell pepper, sliced; * 1 yellow bell pepper, sliced; * 1/4 cup tahini; * 1 1/2 cups Greek yogurt; * 4 pitas