Fry the bacon in a pan until crisp, then leave it to drain on a little kitchen paper.Meanwhile, you can mix the ingredients for the dressing.
Stir the crème fraîche, mayonnaise, buttermilk, spices and herbs together in a bowl. Season to taste with lemon juice, salt and freshly ground pepper.
Cut the lettuce into wedges. Depending on the size of the heads, you can cut each iceberg into 4-6 wedges.
Arrange the lettuce wedges on a large plate and pour the dressing over the top. Sprinkle with the bacon, a little microgreens or chives, and freshly ground pepper.