thinning out spaghetti sauce

[pbandjaeinc]

If you used a jar of spaghetti sauce or several for a large amount of people, what is the best way to thin it out some and not loose the flavor?

[duonyte]

I would use something like broth, which is flavorful, rather than water. I don't find that pasta sauces (tomato based ones) thicken all that much, so just a little should loosen it up without affecting the flavor.

[Dee514]

Sometimes I use a bit of stock, but most often I use some wine. I have even used water (the pasta water works best for this) at times without loss of flavor since it is always a small amount. It usually takes about 1/4 to 1/3 cup extra liquid for my medium sized pot (about 4-5 quarts) of sauce - but I make my own sauce and therefore it probably isn't quite as thick as a jar sauce (which sometimes contain thickeners) to start with.
Many times just putting a lid on the pot while simmering is enough to keep it from getting too thick as the water/moisture is retained instead of evaporating off.