I learned this secret in a restaurant! Juicy chicken in just a few minutes

I learned this secret in a restaurant! Juicy chicken in just a few minutes
Components:
oil: 20 ml
butter: 25 g
garlic: 20 g
whole chicken: 1 pc
salt: 10 g
black pepper: 7 g
red onion: 2 pcs
OVER MEDIUM FIRE: 1 H
Herbs of Provence: 5 g
balsamic sauce: 5 g

Dough:
parsley: 10 g
soy sauce: 40 ml
mustard: 20 g
tomato paste: 25 g
honey: 30 g
salt: 8 g
sweet pepper: 6 g