To make the pear walnut blue cheese salad dressing, combine all ingredients in a small jar with a lid. Shake well to mix the ingredients, then set the jar aside.
Add walnuts to a skillet and toast over medium heat. Stir constantly for a couple of minutes to avoid scorching the walnuts. When the walnuts are fragrant and golden, remove from the heat and let cool.
In a large salad bowl, toss greens with 2 tablespoons of the dressing. Slice the pears thinly and add to the salad. Toss gently. Sprinkle on the walnuts, blue cheese, and raspberries. Serve the dressing on the side. This recipe makes 4 servings.