- 1 cup white sugar
- 1/2 cup buttermilk
- 1/2 cup butter
- 1 teaspoon vanilla extract
- 1 teaspoon baking soda
- Combine sugar, buttermilk, and butter in a large saucepan over medium heat; cook and stir until melted and smooth, about 4 minutes. Stir in vanilla extract. Add baking soda and stir until syrup is frothy and doubles or triples in volume, about 1 minute.