In a medium saucepan, combine the water, soy sauce, and salt. Heat the mixture until it reaches a boil.

Once boiling, add the uncooked rice, remove the pan from the heat, cover it, and let it sit for roughly 5 minutes.

In the meantime, warm the vegetable oil in a skillet or wok over medium heat.

In the hot oil, add the chopped onion and green beans (or peas). Sauté these for about 2 to 3 minutes until they are tender.

Add the beaten egg to the skillet and let it cook for approximately 2 minutes, stirring gently to scramble.

Once the rice has finished resting, transfer it into the skillet with the egg and vegetable mixture. Combine everything thoroughly.

Sprinkle black pepper over the mixture and stir well to blend all flavors before serving.