Chill four serving plates.
In a small jar, combine the vinegar, shallot, mustard, honey, salt, and pepper. Add the olive oil, and shake to incorporate. Shake again before serving.
In a hot sauté pan, toss the olive oil and walnuts quickly to toast (about one minute). Remove from pan and cool on paper towel. Divide the lettuce equally onto the four chilled plates. Cut the pears into quarters and core. Thinly slice the pears and evenly distribute over the lettuce (about 1/2 pear per portion). Top the lettuce evenly with the cheese and the walnuts.
Garnish each salad with raspberries, if desired. Drizzle the vinaigrette over the entire salad.