Here are some ideas to finish off your sauce:

• If you didn’t get the thickening just right or you have other lumps or chunks in your sauce you want to get rid of you can simply strain it through a fine strainer or several layers of cheese cloth.
• Reducing your sauce is a great way to thicken it up a bit, but it will also up the flavors.  Reducing is simple, just simmer the sauce and let the water evaporate until you get the desired consistency.
• You can also add some butter at the end to of your sauce creation to add a richness and smoothness to it.