Dice the onion, potato, and carrot.
Heat cooking oil in a pan and sauté the onion.
Add the potato and carrot, and stir-fry together.
Add pork (or beef, chicken) and stir-fry.
Pour in water and boil until all ingredients are cooked.
Add curry powder and mix well until dissolved.
Simmer over medium heat, stirring until it thickens.
Serve the finished curry over rice.