Kim Rizk, owner of Jammin’ Crepes, and students in PPS Cooks take note of the temperature creeping up past syrup to jam.Crepe batter begins with flour, eggs and milk.Crepe-making is an art that requires practice and a light touch with the trowel spreader.Crepe-making in one corner, and in the other, jam-making.Kim Rizk’s restaurant, Jammin’ Crepes, is at 20 Nassau Street, opposite Princeton University.