1. Toast the pecans in a skillet over medium heat for 3 minutes or until fragrant; set aside. Add 2 teaspoons canola oil to the same skillet, and increase heat to medium-high. Add pears, and sprinkle with brown sugar; do not stir. Cook the pears 5 minutes or until lightly browned on bottom. Stir to melt the brown sugar. Transfer the pears to a plate.
2. Add remaining 1 teaspoon oil to pan. Add shallot, salt, and pepper. Stir 30 seconds or until fragrant. Add apple juice, cider vinegar, and mustard. Whisk; simmer 3–4 minutes or until slightly reduced. Add pears.
3. Place spinach in a large serving bowl. Pour pears and dressing on top, and toss. Divide salad evenly among 4 plates. Arrange Gorgonzola and pecans on top. Serve immediately.