Iceberg Salad with Blue Cheese Dressing

Name: Iceberg Salad with Blue Cheese Dressing
Ingredients: 3 cups 1-inch-cubed crusty white bread; 1/2 cup plus 1 tablespoon vegetable oil; 3/4 pound sliced bacon; 1 garlic clove, crushed; Salt; 2 tablespoons mayonnaise; 3 tablespoons buttermilk; 1 1/2 tablespoons red wine vinegar; 1 teaspoon Dijon mustard; Cayenne pepper; 1/4 pound blue cheese, preferably Maytag, crumbled (3/4 cup); 1 head iceberg lettuce, cut into 1-inch pieces; 1/2 small red onion, thinly sliced; 1 celery rib, thinly sliced