rinse the quinoa then add to a pan of boiling water (roughly 250 ml) and cook on high heat for 2 minutes, then reduce heat to low, put a lid on the pan, and leave to cook while you prepare the rest of the dish
get a frying pan on medium heat and add in some olive oil followed by the mushrooms and cook for about 5 minutes
add the balsamic vinegar, soy sauce and capers to the mushrooms and cook for a further 5 minutes, stirring frequently
thinly slice up the garlic clove and add to a separate pan with some olive oil, then add in the green beans and pan fry for 5 mins - you may also want to add in a splash of water if you like a softer texture
assemble the dish once the mushrooms, green beans and quinoa are all done cooking