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My Onion Tart

Difficulty
Medium
Total Time
2H 30MIN
Cuisine
Ingredients

FOR THE DOUGH

All purpose flour: 2 cup

Cold butter: 1 stick + 1 tbsp (diced)

Salt: to taste

Cold water: 1/3 cup

FOR THE FILLING

Onions: 3.5-4 lb

Salt: to taste

Applewood-smoked slab bacon: 4 oz (cut into thin strips)

Eggs: 4

Heavy cream: 1 cup

Milk: 3/4 cup + 2 tbsp

Parsley: 2 tbsp (chopped)

Pepper: 50 grinds or to taste

Nutmeg: 30 gratings or to taste

Gruyère cheese: 3 oz (or enough to sprinkle liberally over the tart)

(From Gabriel Kreuther: The Spirit of Alsace by Gabriel Kreuther with Michael Ruhlman. Copyright © 2021, published by Abrams. Reprinted and lightly edited by permission of Gabriel Kreuther.)

This is a highlight of Alsatian farm cuisine—a simple onion tart, with bacon and cheese. It’s like a thin quiche. It uses only the simplest ingredients but when properly cooked is a supreme dish. I intensify the traditional recipe by using a puree of steamed onions as part of the custard or flan for more onion flavor and sweetness. This was a regular feature of my childhood. My mother usually served it with a green or celeriac salad.

How to make Gabriel Kreuther's Onion Tart
01.
Make the Dough
  • In a mixing bowl, blend the flour, butter, and salt with your fingertips until the mixture resembles coarse meal with pea-sized lumps.
  • Add most of the water and mix until the dough comes together. Add more water as needed.
  • Knead until smooth and not sticky. Wrap in plastic and refrigerate for 30 minutes.
02.
Prepare the Filling
  • Steam three-quarters of the onions for 1 hour or roast in foil at 350°F until tender.
  • Puree the steamed/roasted onions in a blender until smooth.
  • Thinly slice the remaining raw onions. Slice them by halving lengthwise, cutting through the center, and slicing thinly top to bottom.
  • Place sliced onions in a bowl, toss with 1 teaspoon salt, and set aside.
03.
Blind Bake the Crust
  • Preheat oven to 325°F.
  • Roll out the rested dough and line an 11- or 12-inch tart pan. Poke holes with a fork.
  • Cover with parchment or foil, add weights, and blind bake for 20 minutes.
04.
Cook the Bacon
  • In a saucepan over medium heat, sauté the bacon until cooked and lightly browned but not crispy.
  • Remove from heat and let cool in the pan.
05.
Assemble the Tart
  • Increase oven temperature to 375°F.
  • In a bowl, beat eggs and whisk in cream, milk, onion puree, sliced onion, salt, parsley, pepper, and nutmeg.
  • Pour the mixture into the tart shell.
  • Sprinkle grated Gruyère over the top.
  • Distribute the bacon evenly over the tart. Optionally, drizzle with rendered bacon fat.
06.
Bake and Serve
  • Bake for about 40 minutes, until just set (it should jiggle but not appear liquidy).
  • Cool for 15 minutes before serving warm, or let cool completely to serve at room temperature.
  • The tart keeps well in the fridge for several days.
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