Dice the potatoes, carrots, and onions.
Cut the beef (or chicken) into bite-sized pieces.
Heat cooking oil in a pan and stir-fry the meat.
Add the vegetables and stir-fry together.
Pour in water and bring to a boil.
Add curry powder and stir well to dissolve.
Simmer over low heat until thickened.
Serve the curry over rice to finish.