Buttermilk syrup

I apologize in advance for this recipe. It is totally amazing but definitely not low calorie.

1/2 cup butter
3/4 cup sugar
1/2 cup buttermilk
1 tsp baking soda
1 tsp vanilla

Combine butter, sugar and buttermilk in a medium saucepan over medium heat until sugar completely dissolves. Then remove from heat and add baking soda and vanilla. Stir to combine. Syrup will foam up.