1. Stir together shallot and vinegar and let stand 10 minutes.
2. Whisk in mustard, oil, kosher salt, and pepper to taste until blended.
3. Tear lettuce into bite-size pieces and toss with shallot vinaigrette.
Adapted from Epicurious.com
Add-onsCondiments & Sauces
Add-onsDressings, Oils & Vinegars