Combine 2 cups water and wine in a large saucepan over medium heat. Scrape seeds from vanilla bean; add seeds, bean, and next 3 ingredients (through orange rind) to pan; bring to a boil. Reduce heat, and simmer 15 minutes or until pears are tender. Drain and cool, and discard bean and rinds. Slice pears in half lengthwise, and cut into thin wedges.
Place 1 cup greens on each of 8 plates. Top each serving with 1 red onion slice, 1 tablespoon raisins, 1/3 cup pears, and 1 tablespoon cheese.
Combine oil, vinegar, and mustard in a small bowl; stir with a whisk until smooth. Drizzle about 1 teaspoon dressing over each salad. Serve immediately.