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 beef or pork and stir-fry until cooked.
Pour in 300ml of water and boil until the ingredients are tender.
Add curry powder, mix well, and simmer on low heat for 5 minutes.
Transfer the finished curry sauce to a bowl.