Lemon Crepes With Sweetened Ricotta

The crepes can be filled with the ricotta mixture up to 1 day in advance; refrigerate, covered. Before serving, reheat on a baking sheet at 350° F until warmed through, 3 to 4 minutes. The lemon slices in syrup can be made up to a day in advance; refrigerate in an airtight container. Bring to room temperature before serving.