To prepare Balsamic Vinaigrette, measure all of the ingredients into a mason jar. Tightly screw on the lid and shake vigorously until everything is thoroughly combined.
Immediately after cutting the pear slices, place them in a large plastic baggie and squeeze fresh lemon juice over them. Close bag and gently shake to coat.
In a large salad bowl, layer salad greens, pear slices, pieces of Brie, pomegranate seeds, and toasted pecans
Just before serving, dress with desired amount of Balsamic Vinaigrette and toss until salad ingredients are evenly coated.