Marinade
1 cup plain yogurt
2 tablespoons fresh lemon juice
1/2 teaspoon hot pepper sauce
1 tablespoon white vinegar
4 cloves garlic, minced
1 tablespoon finely minced onion
1/2 teaspoon black pepper
1/2 teaspoon red pepper flakes
1/2 teaspoon ground mace
1/4 teaspoon salt
2 pounds skinless, boneless chicken breast halves, thinly sliced

Condiments
8 (6-inch) pita breads, warmed
1/2 cup plain yogurt (optional)
1 onion, thinly sliced
1 large tomato, diced
1 cucumber, thinly sliced
1 cup Ranch dressing