
Place the onions in a jar; fill with vinegar and water, add salt and sugar, shake, and refrigerate for a few hours or a few days.
Shake all dressing ingredients in a jar until bright and mellow.
Prep all salad greens; chop romaine and herbs, and tear lettuce leaves into bite-sized pieces.
Toss greens, herbs, pickled onions, and dressing together just before serving.
Taste and adjust; add salt and pepper to taste.