Dice the onion, carrot, and potato.
Cut the chicken breast into bite-sized pieces.
Add cooking oil to a pan and sauté the onion.
Add potato and carrot, and cook together.
Add the chicken breast and stir-fry until the surface is cooked.
Pour 200ml of water and simmer until the ingredients are cooked.
Lower the heat and add curry powder, mixing well.
Stir and cook until all ingredients are evenly cooked and the curry thickens.
Serve the finished chicken and tomato curry over rice.