Cut them into thin lengthwise slices, and toss in a bowl with lemon juice. Add the lettuce, cheese, walnuts, and pears to a large bowl, and toss together with the vinaigrette. Season to taste with ...
Cut each head of lettuce into quarters, remove some of the cores, and arragne on 6 salad plates. Cut the tomoatoes into wedges and add to the plates. Pour on the dresssing and serve.