This is curry.
Cut onion, potato, carrot, and beef into bite-sized pieces.
Heat oil in a pot and sauté the onion.
Add potato, carrot, and beef, and stir-fry together.
When the ingredients are cooked, pour in water and bring to a boil.
Once boiling, skim off any foam.
Add curry powder and mix well.
Simmer over medium-low heat for about 20 minutes.
Cool the finished curry and store it in the refrigerator.
For three days, reheat once a day, cool, and store again in the refrigerator.
On the third day, serve the reheated curry with rice.