Add all of the ingredients to a high-speed blender, and pulse until creamy and smooth. Taste and add salt and pepper, as desired. Blend, and taste again.
Pour the mixture into a saucepan, and cook while constantly stirring over medium-high heat until it reduces and thickens, about 10-12 minutes.
Serve immediately, but if you have leftovers, they can be warmed through in a saucepan with an extra splash of milk.