Chopped Salad with Blue Cheese Dressing

Name: Chopped Salad with Blue Cheese Dressing
Ingredients: 1/2 cup walnuts; 1 tablespoon very finely chopped shallot; 1 1/2 teaspoons Dijon mustard; 3 tablespoons sherry vinegar; Kosher salt and freshly ground black pepper; 1/4 cup extra-virgin olive oil; 4 ounces blue cheese, crumbled; 2 romaine hearts, quartered lengthwise and thinly sliced crosswise; 1/2 fennel bulb, cored and finely chopped; 2 carrots, finely chopped; 1/2 seedless cucumber, seeded and cut into 1/2-inch dice; 1 Fuji apple, cut into 1/2-inch dice; 1 Hass avocado, cut into 1/2-inch dice; 2 tablespoons thinly shredded basil leaves