Slice the lemon on a meat slicer ⅛ in/0.3 cm thick.
Place the lemon slices in a small nonreactive saucepot and cover with cold water. Slowly bring to a simmer over medium heat. Drain.
Combine the sugar, water, and corn syrup in a large nonreactive saucepot and bring to a boil. Turn down the heat so the syrup stays just below a simmer and add the lemon