Pecans: Heat 1/2 teaspoon oil in a skillet over medium heat. Add nuts, sugar, and red pepper; cook 4 minutes, stirring constantly. Remove from pan.
Dressing: Whisk together juice and next 4 ingredients (through 1 tablespoon oil) in a bowl; add cheese.
Salad: Combine greens, arugula, and pears in a bowl. Drizzle dressing over salad; toss. Sprinkle with nuts.
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