Peel lettuce and shallots too and wash
Add pinch of salt to lettuce, mix well marinade for 30 minutes
Drain water from lettuce
Heat up a skillet with some oil and cook slowly with the shallots until shallots turn yellow. Separate the dried shallots and oil.
Mix white vinegar, a pinch of salt, sugar and a small amount of cold water together; pour the sauce over the vegetables, topped with shallot oil.