Boil a pot of water (the amount of water should be as much as is needed to cover the ingredients) and as soon as it boils, add the orzo. Season with salt and pepper, then add the tomato sauce and the parsley. Allow it to boil for a while and then add the vegetables. Allow everything to boil and finally, add the oil.

If you notice that it needs more water while boiling you can add a little more (hot water from the kettle so that you don't interrupt the boiling process).

When you serve it add a little lemon juice to your plate.