Roast Chicken in a Butter Crust Recipe

Ingredients

• 3 cups/360 grams all-purpose flour, more as needed
• 1 1/2 teaspoons kosher salt
• 1/2 teaspoon sugar
• 6 ounces/170 grams cold unsalted butter (1 1/2 sticks), cut into large dice
• 1 whole chicken, about 3 1/2 pounds, giblets removed
• Kosher salt and ground black pepper
• 2 tablespoons olive oil or butter
• 2 large celery stalks, cut into small dice
• 1 large carrot, peeled and cut into small dice
• 1 onion or 2 shallots, peeled and chopped
• 1 tablespoon chopped fresh rosemary, thyme or a combination
• 1 egg white