Martha made this recipe on episode 709 of Martha Bakes and paired it with Virginia Peanut Pie.
In a small saucepan, bring sugar and water to a boil; remove from heat. Refrigerate for at least 1 hour or until chilled.
In a large bowl, whisk together buttermilk, lemon juice, corn syrup, and salt. Slowly add chilled syrup; whisk to combine. Stir in lemon zest. Freeze in an ice-cream maker, following manufacturer's instructions.