Pasta with Carmelized Onions, Parmesan and a Balsamic glaze

1/2 pkg angle hair pasta cooked to pkg directions
1-2 onions slices in half and then thinly slices into half moons
1-2 tbsps brown sugar
salt and pepper
1/2 c balsamic vinegar
butter
Parmesan cheese

In a skillet melt several tbsp butter and add the onions, brown sugar, salt and pepper. Allow to brown slowly on med/low heat, stirring often until they turn a carmel color and are sweet and gooey. Meanwhile in a small skillet add the balsamic vinegar and simmer until reduced by half and becoming a syrup like substance. When the onions are done add to the pasta (which you have added a little butter to stop from sticking to each other) with a generous amount of parm. Finish the balsamic sauce with a touch of butter and pour over all the pasta/onions. Serve immediately. YUMMMY!!!!!