Sloppy Buffalo Joes

This recipe is from Rachael Ray. I loved the flavor. I used creamy blue cheese dressing instead of the blue cheese crumbles.
2 tablespoons extra-virgin olive oil
2 pounds ground chicken or turkey breast
1 carrot, peeled and chopped or grated
2 stalks celery, chopped
1 yellow onion, finely chopped
2 to 3 cloves garlic, finely chopped or grated
Salt and freshly ground black pepper
2 tablespoons red wine vinegar
2 tablespoons brown sugar
1 tablespoon Worcestershire sauce
1/4 to 1/3 cup hot sauce (recommended: Frank's Red Hot)
1 cup tomato sauce
1 cup chicken stock
8 good quality burger rolls, split and toasted
1 cup blue cheese crumbles
2 large dill pickles, chopped
Directions
Heat a large skillet with extra-virgin olive oil over medium-high heat. Add meat and break it up with wooden spoon, cook 5 to 6 minutes. Add in carrots, celery, onions and garlic, season with salt and freshly ground black pepper, cook 7 to 8 minutes more. In a bowl combine the vinegar, sugar, Worcestershire, hot sauce, tomato sauce and stock. Pour into the pan and stir to combine. Simmer a few minutes more. Pile sloppy Buffalo filling onto buns and top with blue cheese and chopped pickles