Bread flour • Instant dry yeast • Salt • Water, 35℃ / 95 F • Unsalted butter, room temperature • little olive oil or vegetable oil • First rising: 35℃ / 95 F, 45 mins or more • Second rising: 30-35℃ / 86-95 F, 30 mins or more • Bake at 220℃ / 428 F for 35-40 minutes (preheat the oven to 250℃ / 482 F)