In a blender, process the vinegars, broth, shallots and olive oil until smooth. Pour into a small dish. Stir in the parsley and rosemary. Season the dressing to taste with salt and pepper.
ASSEMBLE THE SALAD:
In a large bowl, toss the spinach and pecans with enough dressing to coat. Divide the salad among 4 plates. Top with sliced pears and sprinkle with cheese.