In a dish, mix together the malt vinegar, 1/4 cup yogurt, vegetable oil, mixed spice, cardamom, salt and pepper

Place the chicken thighs into the mixture and turn to coat. Cover and marinate in the refrigerator for at least 4 hours or overnight

Preheat the oven to 350 degrees

In a small bowl, mix together the yogurt, garlic, lemon juice, olive oil

Season with salt and pepper, taste and adjust the flavors. Cover and refrigerate

Cover the chicken and bake in the marinade for 30 minutes, turning once

Uncover, and cook for an additional 5 to 10 minutes or until chicken is browned and cooked through

Remove from the dish and cut into slices

Place sliced chicken, tomato, cucumber and lettuce onto pita bread

Roll up and serve