Roquefort and Toasted Walnut Salad

1/4 cup coarsely chopped walnuts, toasted

2 tablespoons lemon juice

1 clove garlic

1/8 teaspoon salt

1/8 teaspoon pepper

1 small head radicchio, torn into bite-size pieces (4 cups)

1 head Bibb lettuce, torn into bite-size pieces (4 cups)

1/2 cup crumbled Roquefort or blue cheese (2 oz)

1/2 cup 1/2-inch pieces fresh chives

1/3 cup coarsely chopped walnuts, toasted