To prepare marinade, combine lemon juice, 1 teaspoon olive oil, 1 clove garlic, bell peppers, oregano, salt, and black pepper in a small mixing bowl. Pour marinade over turkey in a shallow dish and stir to coat turkey. Cover and let stand 2 hours in refrigerator. Meanwhile, to prepare onion relish, combine remaining oil in a skillet over medium heat. Add remaining onions, cloves, and garlic; cook until tender. Stir in brown sugar, vinegar, water, tomato paste, and worcestershire sauce. Simmer for 15 minutes. Keep warm. Take marinaded turkey out of refrigerator and place in a skillet and stir-fry over medium-high heat until hot. Fill tortillas with turkey and top with onion relish. Sprinkle with cheese.