This tart is a terrific substitute for Quiche Lorraine. We used speck, the smells of which makes your mouth water while it's frying, but don't go crazy trying to find it if it's not readily available; bacon should be fine. Also, white onions are milder than yellow (they're used a lot in Mexican cooking for salsas), so if you only have yellow, perhaps you won't be getting the full Swiss experience (but don't let that stop you from making one). We do, however, recommend buying a tart pan if you don't own one. They're not that expensive, and we guarantee that once you use it, you'll be hooked.
Swiss Onion Tart
This tart, which comes from baker Nick Malgieri, uses a salty, smoky ham known as speck, a traditional ingredient in this tart; bacon is a good substitute.
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Credit: Todd Coleman
FOR THE CRUST:
1 1⁄2 cups flour
1⁄2 tsp. baking powder
1⁄4 tsp. kosher salt
8 tbsp. unsalted butter, chilled and cubed
FOR THE FILLING:
3 oz. speck or bacon, finely chopped
3 tbsp. unsalted butter
1 1⁄2 lbs. white onions (about 3), finely chopped
Kosher salt to taste
1⁄2 cup milk
1⁄2 cup heavy cream
3 eggs
3 oz. grated Gruyère or Swiss cheese
Freshly ground black pepper and freshly grated nutmeg
1. Make the crust: Pulse flour, baking powder, and salt in a food processor to combine. Add butter and pulse until pea-size pieces form. Add 1⁄4 cup ice-cold water; pulse briefly. Transfer dough to a floured work surface; form into a disk. Wrap in plastic wrap; chill for 1 hour.
2. Heat oven to 425°. Transfer dough to a floured work surface. Roll dough into a 13" circle; transfer to an 11" fluted tart pan with a removable bottom, pressing into bottom and sides. Trim excess dough; chill for 30 minutes. Prick bottom of dough with a fork; cover bottom with a sheet of parchment paper; fill with dried beans. Bake until crust is set, about 20 minutes. Remove paper and beans; bake until crust is light brown, about 15 minutes. Let cool.
3. Meanwhile, make filling: Cook bacon in a 4-qt. saucepan over medium heat until crisp, 7–8 minutes. Using a slotted spoon, transfer bacon to a plate. Discard bacon fat; add butter. Add onions and season with salt; reduce heat to low, cover, and cook, stirring occasionally, until soft, about 10 minutes. Uncover; cook until lightly browned, 10 minutes. Let cool.
4. Whisk milk, cream, and eggs in a bowl; add reserved bacon and onions along with cheese. Season with salt, pepper, and nutmeg. Pour filling into tart; place on a baking sheet. Place tart in oven and reduce heat to 400°. Bake until filling is golden brown and set, 45–50 minutes. Transfer tart to a wire rack to let cool completely before slicing and serving.
SERVES 8 – 10
