Wash the sliced chicken breasts thoroughly with lemon, vinegar, salt, and water. Then drain them well.

In a bowl, mix the onion juice, thyme, mixed spices, curry powder, black pepper, salt, vinegar, plain yogurt, and grated tomato.

Add the chicken breast slices to the marinade mixture. Set them aside for at least 3 hours.

Grill the marinated chicken on a preheated grill until fully cooked and browned.

Serve the chicken alongside a salad and a portion of mashed potatoes.