Pour broth and wine into a medium saucepan and bring to boil for 5 minutes, then simmer.
In a large saucepan, heat oil and butter. It’s in this pan that the risotto will cook. Add the leek and cook on medium heat for 5 minutes until tender. Add the mushrooms and cook again for 5 minutes.
Add Arborio rice and cook while stirring so that the grains become transparent.
Add 1/2 cup boiling broth, mixing until completely absorbed. Add 1/2 cup of broth again and stir well. Continue with the rest of the broth, 1/2 cup at a time.