Get all your salad components ready.
Fry the bacon drain on kitchen paper and chop up all the salad ingredients.
Whisk all the dressing ingredients together until emulsified.
Just before you are ready to serve, peel away the endive leaves. Toss the apple, celery and fennel together with half the chopped nuts. Pour over enough dressing to coat.
Spoon the dressed salad into the endive leaves and arrange these on a platter or large serving plate.
Sprinkle over the crumbled blue cheese, crispy bacon, and the remainder of the nuts.
Drizzle a little more dressing over the salad boats and serve immediately.