Free-Form Onion Tart

Free-Form Onion Tart was pinched from <a href="http://www.foodandwine.com/recipes/free-form-onion-tart" target="_blank">www.foodandwine.com.</a>
INGREDIENTS
Dough
1 cup all-purpose flour
1/4 teaspoon salt
6 tablespoons unsalted butter, cut into small pieces and chilled
5 tablespoons ice cold water
Filling
4 tablespoons unsalted butter
2 1/2 pounds sweet onions, thinly sliced
6 thyme sprigs
2 tablespoons crème fraîche
Salt and freshly ground pepper
1 egg beaten with 1 tablespoon of milk
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