Place a large pot on a medium heat.
Add the oil and onion and sauté for 5 mins, add half the mushrooms, garlic and sage. Sauté for another 5 mins.
Pour over the rice, milk and stock, bring to the boil then simmer until the liquid is all absorbed and the rice is cooked through.
Add the edamame beans. You will need to stay near, to stir constantly so it doesn’t stick to the bottom. Season with salt and leave to the side, lid on.
Heat a frying pan with a little olive oil and fry off the rest of the mushrooms with some salt for 5 mins until golden brown. Serve all together with some chilli flakes.