If its name spontaneously assimilates it to the popular fruit tarts, the lemon pie is, at the beginning, only a cream originating from the United Kingdom. The first traces of it appear in the 18th century and its recipe, probably created by the Quakers, has evolved little since: eggs, butter, flour and powdered sugar mixed with a little zest of the citrus fruit.
By migrating to the United States, the religious community brought this dessert to the Americans who transformed it into a cake with the addition of a shortbread dough. Another variable is that they prefer lime, which, with its high vitamin C content, prevented scurvy among sailors.
Still in the 18th century, more precisely around 1720 but this time in Switzerland, a meringue version appeared under the impulse... of an Italian chef!