Heat a tbsp olive oil in a large frying pan, then add the onions and cook until soft, about 10 mins.
Put the mushrooms into a food processor and whiz until finely chopped. Add these to the pan with the mushrooms and garlic and cook for 10 mins. Season.
Whizz the walnuts and parsley in the food processor, add the cooked mushroom mix, blue cheese and quinoa and whizz to combine well (you want the mix to be broken down enough to shape into balls easily).
Check that the mix is well seasoned before shaping it into balls and rolling in flour.
Heat a little oil in a frying pan. Add the balls and fry for 5 to 6 minutes until golden on all sides.
Mix the salad, dress, and serve with the cooked quinoa balls.