Pat chicken dry with paper towels. Heat ½ tsp of the olive oil in a large fry-pan on medium-high heat. Season chicken with salt and pan-fry in two batches, adding remaining oil in between, for 1-2 minutes on each side until golden brown (it does not have to be cooked all the way through). Set chicken aside on a plate and keep pan on the heat.
Add bacon, mushrooms, onion, capsicum and celery/fennel to the pan, with a good pinch of salt, and cook for about 6 minutes, until vegetables are soft. Add garlic, rosemary and dried herbs, and continue cooking for 2 minutes or so.
Add wine/verjuice/stock and bring to the boil for a minute or two, then stir in crushed tomatoes, tomato paste, red wine vinegar, browned chicken and olives. Simmer for 8-10 minutes until sauce has slightly thickened and chicken is cooked through. Season to taste with salt and pepper and scatter parsley on top.
Serve with cauliflower parsley mash and sautéed vegetables.