Start by cooking the rice. Everyone has a different method of cooking rice so I will leave this one up to you. It should take about 20 minutes for the rice to cook.
Head a non-stick frying pan on high heat. After 2 minutes add the olive and the cashews. Cook for a few minutes until it becomes slightly toasted then put it in a bowl and set it aside.
In the frying pan add a generous amount of oil and stir-fry the onions on high heat for a few minutes. Add the garlic and cook for about a minute. Next add the zucchini and mushrooms and continue cooking for 3-4 minutes.
In the meantime, in a small bowl combine the soy sauce, water, brown sugar and tapioca starch. Stir well and set aside.
Add the sauce to the pan followed by the cashews and mix well. Cook this for a minute or so to make sure all the flavours combine then remove from the heat and serve hot with jasmine rice.