In a large bowl add the salt and vinegar. Mix well with a fork until the salt is dissolved. Add the mustard, pepper, shallots and blend well. Add the olive oil, slowly and steady and whisk until smooth.
Wash the butter lettuce. Torn into pieces and add it to the vinaigrette and gently fold the lettuce until all the leaves are covered.
Notes
As soon as you mix your butter lettuce or Boston Bibb salad, enjoy immediately.
Giangi's Kitchen provides nutritional information, but these figures should be considered estimates, as a registered dietician does not calculate them.