Prepare the dressing: Combine all the ingredients in a tall mixing bowl and purée to make a creamy dressing. If necessary, add a little water. Season with salt, pepper, and cayenne pepper.
Prepare the salad leaves: Select, wash, and spin dry the salad leaves. Arrange them high in the centre of plates
Prepare the pears: Wash and quarter the pears, remove the core, and cut the quarters into fine slices. Arrange them on edge in a star shape around the salad.
Finish and serve: Sprinkle the roasted chopped walnuts on top, drizzle with the dressing, and serve immediately.