Make the Dressing: In a small bowl, whisk together olive oil, vinegar, mustard, lemon juice, sugar, salt, and pepper until smooth and emulsified.
Candy the Pecans: Heat a dry skillet over medium heat. Sprinkle sugar into the pan and let it start to melt, then add pecans. Stir constantly until coated. Transfer to parchment paper to cool.
Assemble the Salad: In a large bowl or platter, layer mixed greens. Arrange pear slices over the greens. Top with Gorgonzola and candied pecans.
Finish & Serve: Drizzle with vinaigrette just before serving.