Onion Tart

January 1, 2014

Print Friendly and PDF

I found this recipe in the Food & Wine Magazine awhile ago. I made it for the first time last Fall. Jeff loves this stuff ~ I think almost better than chocolate cheesecake.



    1 cup all-purpose flour
    1/4 teaspoon salt
    6 tablespoons unsalted butter, cut into small pieces and chilled
    5 tablespoons ice cold water


    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


In a bowl, whisk the flour with the salt. Using your fingers, rub the butter into the flour until the mixture resembles coarse meal. Drizzle the water over the flour and stir gently just until incorporated; gently press to form a dough. Flatten the dough into a disk, wrap in plastic and refrigerate for 1 hour.

In a skillet, melt the butter. Add the onions and thyme and cook over moderately high heat, until softened, about 10 minutes. Reduce the heat to moderately low and cook, until the onions are golden, 20 minutes longer. Remove from the heat and discard the thyme. Stir in the crème fraîche and season with salt and pepper. Let cool.

Set a pizza stone on the bottom of the oven or position a rack on the lowest rung and preheat the oven to 375°. Line a large baking sheet with parchment paper. On a floured work surface, roll out the dough to a 12-inch round and transfer to the baking sheet. Spread the onions on the round, leaving a 1 1/2-inch border. Fold the edge of the dough up and over the filling and brush the edge with the egg wash.

Bake the tart on the stone or on the bottom shelf for about 40 minutes, until the dough is richly browned on the bottom.

Transfer the tart to the top shelf and bake for about 5 minutes longer, until the top of the crust is browned. Transfer the tart to a rack and let cool slightly. Cut the warm tart into wedges and serve.


I substituted heavy whipping creme for the crème fraîche.
I skipped the egg wash.
If you have a mandoline to slice the onions, it will save you a lot of time. Watch your fingers and use the safety when using your mandoline. Slice them thin.
If you have a heavy pan to cook the onions, I would suggest it as it will cook the onions more evenly.
A pastry cutter to mix the dough works well.
I rolled the dough on the parchment paper and used a wooden pizza peel to put it on my preheated pan

Leave a Comment

Previous post:

Next post: