01 - Heat a nonstick skillet over medium heat. Add walnuts, sugar, and butter; stir constantly for 3 to 4 minutes until sugar melts and coats walnuts. Sprinkle with sea salt. Transfer to parchment-lined plate and cool.
02 - Combine olive oil, apple cider vinegar, Dijon mustard, honey, salt, and pepper in a small bowl. Whisk until emulsified and smooth.
03 - In a large bowl, toss mixed winter greens with half of the vinaigrette. Arrange on a serving platter or distribute onto individual plates.
04 - Top greens with thinly sliced pears, red onion, crumbled cheese, and candied walnuts evenly.
05 - Drizzle remaining vinaigrette over the assembled salad just prior to serving.