The Lemon Server is designed to slide under the lemon slices, pick them up, then serve them. These pieces are rare since they were only produced in a few patterns. Sometimes they can be confused with the croquette server but if you compare the two, you will see the croquette server is flat and the lemon server has a raised edge on one side.
(Shown in Georgian by Towle)
(Shown in Grand Barouque by Wallace)