1. Heat 2 tbsp oil in a deep frypan, add onion and cook for 1 minute. Add rice, stirring to coat with oil, about 2 minutes.
2. Pour in wine and stir constantly until the wine is fully absorbed. Add hot stock and water to the rice, turn heat to lowest setting and simmer, stirring occasionally until the broth is absorbed. If needed continue adding stock or water 1/2 cup at a time until the liquid is absorbed and the rice is tender, about 15 to 20 minutes.
3. Whilst rice is cooking heat 2 tbsp oil in a large pan and brown chicken, add the mushrooms and cook for 2 minutes. Add radiccio and cook for a further 2 minutes. Remove from heat.
4. Once risotto is tender add the chicken, mushroom, radiccio and parmesan into the pan and stir to combine. Season with salt and pepper to taste.