Whatever you do with it, save a bit of it to use as a starter for more creme fraiche - mix heavy cream with a bit of creme fraiche (abt 1/4 cup per quart) and leave out in a covered container in a warm place overnight. In the morning, stir it and if it's thickened you have new creme fraiche. If it's not thick let it sit out for a few more hours in a warm place.
I like it a lot in the many savory applications linked to with the site search, but I also enjoy one of the purest ways to appreciate its flavor--whipped creme fraiche. Just whip as you would whipping cream. You can keep it plain or add vanilla and sugar, or maple syrup. I love it with berries or some sort of fruit compote or crumble.
If you want to use up a good amount, try the quiche Tartine Bakery is famous for (among other things):
http://www.localforage.com/local_forage/2006/10/on_sunday_i_got.html
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http://www.food52.com/recipes/search?filter=p&search=creme+fraiche
http://www.localforage.com/local_forage/2006/10/on_sunday_i_got.html