French Onion & Blue Cheese Tart

August 26, 2021
0 Ratings
Photo by Chris Terry
  • Prep time 25 minutes
  • Cook time 45 minutes
  • Serves 8
Author Notes

Given how often we need onions to start a recipe, let’s not forget or discount how important they really are. So in this tart I’ve made them the star of the show, sweet and lightly scented, in pride of place on a layer of light, puffy pastry and delicious crumbled blue cheese.

Reprinted from Nadiya Bakes by Nadiya Hussain. © 2020 by Nadiya Hussain. Photographs © 2020 by Chris Terry. Published by Clarkson Potter, an imprint of Random House, a division of Penguin Random House LLC.
Nadiya Hussain

What You'll Need
  • 2 tablespoons unsalted butter
  • 2 large sprigs of lemon thyme
  • 1 garlic clove, grated
  • 5 onions, thinly sliced (you will need about 2 pounds 2 ounces/1 kilogram)
  • 1 teaspoon freshly ground black pepper
  • 1 teaspoon salt
  • 2 teaspoons granulated sugar
  • 1 sheet of pre-rolled puff pastry
  • 1 egg, lightly beaten
  • 5 1/4 ounces (150 grams) blue cheese
  • 1 handful chopped fresh chives, to serve
  1. Start by cooking the onions. They need to be cooked slowly on low heat, so it’s best to begin with those. Melt the butter in a large nonstick frying pan—we have a load of onions to cook. When the butter has melted, pick off the thyme leaves and add, then add the garlic and onions. Mix everything together. Now add the pepper, salt, and sugar and mix. Cook on medium heat for 30 minutes, stirring occasionally, until you have onions that look like the kind you would only eat with a burger in a Sunday market at 6 a.m.!
  2. While that cooks, start on the pastry. Heat the oven to 400°F. Line a baking sheet with some parchment paper or use the paper the pastry comes in and roll out the pastry onto the sheet.
  3. Using a knife, score a smaller rectangle ½ inch/1 centimeter inside the pastry rectangle, making sure not to cut all the way through. Pierce the inner rectangle with a fork all over to allow the steam to escape when it bakes.
  4. Brush the edges with the egg and bake for 20 minutes, until golden all over.
  5. Take out and, using the back of a spoon, push down all the puffed-up pastry of the inner rectangle, creating a nice neat border.
  6. Take the blue cheese and crumble all over the inner rectangle of the pastry. Add the onions and scatter them all over till you have an even layer. Now bake for 15 minutes.
  7. Take out and let cool for 10 minutes before eating, sprinkled with the chives.

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