How to Make It
Mix shallot in a bowl with 1/4 tsp. salt and the vinegar and let stand about 5 minutes to allow shallot to pickle slightly and salt to dissolve. Whisk in oil. Taste and add more vinegar if you want a sharper dressing, or more oil if you prefer it mellower.
Wash lettuce and dry well, then combine with herbs in a large bowl or on a platter.
Toss lettuce and herbs with a few pinches of salt. Drizzle with dressing and toss gently until leaves are well coated. Taste and add more salt if you like, and some pepper; then toss again.
*Barrel-aged vinegar is made the traditional way, fermented over several weeks in barrels or casks. It has a distinctively rich, deep, fruity flavor and is not hard to find; most grocery stores will have one or two brands.