Iceberg Wedge with Smoked Bacon and Roquef

Name: Iceberg Wedge with Smoked Bacon and Roquef
Ingredients: * 2 head iceberg lettuce, outer leaf removed if necessary; * 8 ounce unsliced smoked bacon; * 1 cup buttermilk; * 1 cup mayonnaise; * 2 ounce roquefort cheese, crumbled (about 1/2 cup); * leaf from 2 sprig tarragon; * salt and freshly ground black pepper; * 4 roma (plum) tomato or other ripe tomato, very thinly sliced