French Onion Tart with Gruyere (Flaky Puff Pastry)
Make a savory French onion tart with slow-cooked onions, Dijon, Gruyere, and flaky puff pastry. It slices cleanly for appetizers, lunch, or a cozy…
Recipe Saint is a recipe index: we list the ingredients so you can search, save and plan. The full method, times and servings are on the publisher's page at quickierecipe.com.
Cooking tools:
- Chef's knife
- Cutting board
- Skillet
- Wooden spoon
- Measuring spoon
- Measuring cup
- Parchment paper
- Rolling pin
- Fork
- Baking sheet
- Kitchen towel
- Oven
- Stove
- Cooling rack
- Pastry brush
- Mixing bowl
- Spatula
- Bench scraper
- Kitchen timer
Ingredients
- 3 tablespoons unsalted butter
- 1 tablespoon olive oil
- 2 lb (900 g) yellow onions, thinly sliced
- 3/4 teaspoon kosher salt, plus more to taste
- 1 teaspoon fresh thyme leaves, plus more for garnish
- 1/2 teaspoon freshly ground black pepper
- 2 teaspoons sherry vinegar
- 1 sheet frozen puff pastry, about 14 oz (400 g), thawed but cold
- 1 tablespoon all-purpose flour, for rolling
- 1 tablespoon Dijon mustard
- 5 oz (140 g) Gruyere cheese, coarsely grated
- 2 tablespoons chopped fresh chives
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