I finally found the trick for the most juicy and tender chicken!

Ingredients:
an entire chicken: 1 pc
vinegar: 20 ml (0.7 fl oz)
salt: 5 g (0.2 oz)
soy sauce: 50 ml (1.7 fl oz)
mustard seeds: 10 g (0.4 oz)
chili flakes: 2 g (0.1 oz)
oregano: 5 g (0.2 oz)
garlic powder: 5 g (0.2 oz)
sweet paprika: 5 g (0.2 oz)
potatoes: 400 g (14 oz)
cherry tomatoes: 200 g (7.1 oz)
onion: 2 pc
zucchini: 1 pc
mushrooms: 6 pc
green bell pepper: 100 g (3.5 oz)
red bell pepper: 1 pc
salt: 5 g (0.2 oz)
black pepper: 5 g (0.2 oz)
sweet paprika: 5 g (0.2 oz)
herbs of Provence: 5 g (0.2 oz)
vegetable oil: 20 ml (0.7 fl oz)