If you want to make crispy chicken skin, remove the skin from the chicken before boiling it.
Boil the chicken for about 1 hour. Add salt, peppercorns, thyme, rosemary, onion, and bay leaves to the cooking liquid. Ideally, let the chicken cool down in the liquid and preferably steep in the brine overnight.
Remove the meat from the chicken and cut it into rough cubes.
Mix mayo, crème fraîche, Dijon mustard. Season with lemon juice and zest, salt, and pepper. It should have a good bite from the Dijon mustard.
Fry the bacon until crispy and drain it on a piece of absorbent paper.
Slice the mushrooms and fry them in the bacon fat. Add a bit of extra butter or oil if there isn’t enough fat for frying.
When the bacon and mushrooms have cooled, mix them into your dressing along with the chicken meat. Chickens vary in size and meat quantity, so assess whether all the meat should be mixed in.