Prepare your dressing by placing all of the ingredients into a mason jar or other tightly lidded container. Shake vigorously, until the ingredients are completely combined.
For the salad, begin by lightly toasting the walnuts in a hot skillet over the stove. You will know that they are ready when they give off a pleasing aroma. Slice the Bartlett pears into thin slices. Place pear slices into a large bowl and coat with 1 T. dressing. Toss until each slice is completely coated. Add the lettuce, arugula and toss until all are coated with dressing, adding more if desired. Top with walnuts, serve and enjoy!