Cut off the base of the iceberg lettuce, cut it in half, and once again in half or third to yield wedge-shaped pieces. Larger iceberg lettuces will yield 6 wedges, smaller heads will yield 4.
Make the blue cheese dressing, if you haven't made it already or purchased it, and refrigerate it until ready to serve.
Cook the bacon slices in the microwave. Let them cool down and chop them on a cutting board into bits.
Assemble:
Plate all the wedges on a platter or on individual plates.
Spoon about 2 tablespoons of blue cheese dressing over each wedge. Sprinkle the bacon crumbles on top, and distribute the cherry tomatoes and red onion slices (if using). Grind black pepper over the top, to taste.