Before baking it, I boil it in onion! How to fry the entire chicken correctly

Ingredients:
an entire chicken – 1 piece
water – 2 l
salt – 10 g
black peppercorns- 10 g
bay leaves – 4 pieces
onion – 2 pieces
celery – 3 pieces
garlic – 3 cloves
parsley – 50 g
herbs of Provence- 5 g
TO BOIL 10 MIN
onion – 4 pieces
potatoes – 700 g
olive oil
salt – 5 g
black pepper – 3 g
chili flakes – 3 g

for the sauce:
olive oil – 20ml
herbs of Provence – 5 g
mustard – 10 g
Tray size 32 X 32 cm
IN THE OVEN 180 °C/40 minutes

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