Dice the potatoes and soak them in water to remove starch.
Cut carrots and onions into pieces the same size as the potatoes.
Heat cooking oil in a pan, stir-fry the potatoes until half cooked, then add carrots and onions and continue stir-frying.
Add curry powder and water, then mix well.
Simmer until everything is fully cooked.
Taste and add salt if needed.
Spoon the curry over rice to serve.