Roasted Celery Heart and Blue Cheese Salad

Name: Roasted Celery Heart and Blue Cheese Salad
Ingredients: FOR THE SALAD:; 2 3-inch root ends of celery, cut from 2 heads; 1 tablespoon olive oil; 1/2 teaspoon ground fennel; 1/2 teaspoon ground coriander; 1/2 teaspoon salt; teaspoon black pepper; FOR THE DRESSING:; 2 slices bacon, thick cut; 1 tablespoon sherry vinegar; 1 teaspoon salt; 1/4 teaspoon black pepper; 1 orange, cut into segments; Pale green celery leaves, reserved from inner stalks of celery; 3 red radishes, cut into small matchsticks; cup hazelnuts, roasted and coarsely chopped; cup blue cheese, crumbled