In a small saucepan, bring ¾ cup water and salt to a boil. Whisk in grits; cook, whisking constantly, for 4 minutes. Whisk in butter, and cook for 1 minute. Let cool slightly.
In a large bowl, whisk together sugar, buttermilk, flour, eggs, and vanilla until smooth. Whisk grits into sugar mixture. Pour into prepared crust.
Bake until set, 35 to 40 minutes. Let cool completely on a wire rack before serving. Garnish with whipped cream and strawberries, if desired.
Recipe by Paula Deen Magazine at https://pauladeenmagazine.com/grits-pie/