Boiled Buttermilk Glaze

I come from a family of frosting haters. So, any glaze or frosting that I use has to be mighty special. It can't be "too sweet" or "too thick"...like Goldilocks, it has to be "just right." This delightful recipe makes a non-too-sweet topping, thicker than a glaze and thinner than a cream cheese frosting. I use it on cakes that require only a tiny amount of additional sweetness to make them perfect. The colour of this glaze turns a caramel colour when cooked, so take that into consideration if using on a white cake. It's good on it's own but when either orange or lemon zest is added, it's even better.