Word Study
sally lunn
CIDE DICTIONARY
sally lunn, [From a woman, Sally Lunn, who is said to have first made the cakes, and sold them in the streets of Bath, Eng.].
A tea cake slighty sweetened, and raised with yeast, baked in the form of biscuits or in a thin loaf, and eaten hot with butter. [1913 Webster]
OXFORD DICTIONARY
sally lunn, n. Brit. a sweet light teacake, properly served hot.
Etymology
perh. f. the name of a woman selling them at Bath c.1800
For further exploring for "sally lunn" in Webster Dictionary Online