Combine vinegar, soy sauce, worcestershire, molasses, peppercorns, salt, garlic, and bay leaf.
Put chicken in sous vide bag together with the marinade. Refrigerate overnight.
Pre-heat water bath to 165F.
Cook chicken for 2 hours.
Drain chicken out of the liquid in the bag and air-dry for 10 minutes.
Reduce cooking liquid to half its volume in a saucepan.
Brush chicken with olive oil, season lightly with salt, and broil for 10 minutes at 220C.
Serve chicken with sauce.