My grandfather was right! A secret trick that many chefs hide from us! Chicken recipe!

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Ingredients:
1 piece chicken (1200-1300 gr).
Onion 1 pc.
Garlic 2 cloves.
Tomato 1 pc.
Coriander 1 tsp.
Ground black pepper 1 tsp.
Cumin 1 tsp
Salt 1 tsp
Potatoes 1 kg.
Butter 100 gr.
Vegetable oil for frying 500 ml + 50 ml.