Preheat the oven to 135 C.
Cut the coq into pieces. CUt the bacon into small chunks, removing the fat. Quarter the large onions into chunks. Melt the butter in a large pot. Brown the coq on all sides. When the browning is started, add the onions, garlic, bacon, herbes de Provence, mushrooms, salt and pepper. Mix until the coq is browned.