If you begin looking for traditional coq au vin recipes, you may just become a little frustrated! Every region in France tends to have their own version. My best tip is to not use a gutsy red such as cab sav, but a lighter, fruitier pinot noir, or at a push, a shiraz.
Note that you will need to start this dish the night before, or at a pinch first thing in the morning for an evening meal...
Heat the oil in a 4-6 litre pot, add the butter and then the onions, bacon and mushrooms, and cook, stirring, until softened. Remove and set aside.