Wash and dry the lettuce. If using butter lettuce, tear into smaller pieces. Set aside while you make the dressing
In a small bowl, combine the oil and vinegar, salt and sugar. Whisk until the salt and sugar dissolve.
Add the cream and whisk until smooth. Note! It will look curdled at first, just keep whisking.
Add the diced onion and herbs.
When you are ready to serve, toss with Lettuce until coated. Then plate on small salad plates.
Notes
Because I generally serve this on small plates, I use a standard mixing bowl to prepare the salad, not a nice salad bowl. But you decide for your home.Butter Lettuce wilts fairly quickly, so once the salad is dressed, don't linger... eat!!