Balsamic Butter Sauce for meat/fish/vegetables

Looking for a sauce to have with salmon this afternoon, I came across this one. I'm not a salmon lover

but its in my spartan plan, so I thought a sauce would help. It really is great, but who doesn't love butter. I just might put salmon in my meal plan more often since this is a simple and a great sauce.

I would imagine its heaven on potatoes! 

1/4 cup balsamic vinegar

2 clove's garlic,  minced

1/2 cup butter

In a small saucepan, over medium heat, simmer the vinegar and the garlic.

Simmer until reduced to a thick syrup, about 5 minutes. Set aside while the rest of

the meal is prepared.

When ready to serve the sauce, re-warm over medium low-heat. Cut a stick of butter

into 6-8 pieces and add to the balsamic reduction one piece at a time. Whisk until all

the butter is incorporated and the sauce is smooth again. 

Season with salt and pepper if desired.

Drizzle over mashed potatoes, fish and vegetables.