Dice the onion, potato, carrot, and zucchini.
Add cooking oil to a pan and sauté the onions.
Add the potatoes, carrots, and zucchini and stir-fry together.
Pour in 200ml of water and bring to a boil.
Once the vegetables are cooked, add curry powder and stir while simmering.
Season with salt and pepper to taste.
Serve the finished curry over rice.