French Chicken in a Pot

This is quite simply one of the best things I have ever cooked. It goes right every single time and tastes so delicious I have served it on many occasions to guests. So incredibly tender, it falls apart in your hands. This recipe is not exactly time fast, it just does not require much of your time. It does cook for a few hours, but I can hang with that. It would be a perfect recipe if you want to make a bit of a jump away from usual cooking methods. 
 EVERYONE likes this recipe. I usually serve with red potatoes sauted with a bit of olive oil and rosemary. The potatoes soak up the yummy sauce created from the chicken.

It comes from the ever tenacious, America's Test Kitchen. 

French Chicken in a Pot

1 (4 1/2-5 lb) whole roasting chickens, giblets removed and discarded, wings tucked under back
2 teaspoons kosher salt (use 1/2 the salt for a kosher chicken) or 1 teaspoon table salt (use 1/2 the salt for a kosher chicken)
1/4 teaspoon ground black pepper
1 tablespoon olive oil
1 small onion, chopped medium (about 1/2 cup)
1 small celery rib, chopped medium (about 1/4 cup)
6 medium garlic cloves, peeled and trimmed
1 bay leaf
1 medium fresh rosemary sprig (optional)
1/2-1 teaspoon lemon juice
Directions:

1. Adjust oven rack to lowest position and heat oven to 250 degrees. Pat chicken dry with paper towels and season with salt and pepper.

2. Heat oil in large (5- to 8-quart) Dutch oven over medium heat until just smoking. Add chicken breast-side down; scatter onion, celery, garlic, bay leaf, and rosemary (if using) around chicken. Cook until breast is lightly browned, about 5 minutes. Using a wooden spoon inserted into cavity of bird, flip chicken breast-side up and cook until chicken and vegetables are well browned, 6 to 8 minutes.

3. Remove Dutch oven from heat; place large sheet of foil over pot and cover tightly with lid. Transfer pot to oven and cook until instant-read thermometer registers 160 degrees when inserted in thickest part of breast and 175 degrees in thickest part of thigh, 80 to 110 minutes.

4. Transfer chicken to carving board, tent with foil, and rest 20 minutes. Meanwhile, strain chicken juices from pot through fine-mesh strainer into fat separator, pressing on solids to extract liquid; discard solids (you should have about 3/4 cup juices). Allow liquid to settle 5 minutes, then pour into saucepan and set over low heat.

5. Carve chicken, adding any accumulated juices to saucepan. Stir lemon juice into jus to taste. Serve chicken, passing jus at table