Madeleineeggcake， also known as"shell cake".In 1730, the exiled Polish king Stanisław Leszczyński stayed in Commercy.dessertjust before dessert, his personal chef disappeared unexpectedly.In a rush, a maid served her specialty as a last-minute treat.biscuitit was well-received by the king and named after the maid, Madeleine. Therefore, madeleines are also known as shell cakes.