In a bowl, combine the salad dressing ingredients and whisk to combine.
Place each wedge of lettuce on a small salad plate. Gently spoon the dressing over each wedge. Add the tomatoes, onions and extra crumbled blue cheese on top and season with salt and pepper to taste. Enjoy immediately.
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Notes
Storage: Store any leftovers in an airtight container for up to 3 days. It's best to store the salad ingredients separately from the dressing so that it doesn't get soggy.Make ahead: The blue cheese dressing can be made 2 or 3 days ahead of time and kept covered in the fridge.