French Onion Soup Tarte Tatin Recipe

Ingredients

• 1/2 batch Old-Fashioned Flaky Pie Dough or 1 sheet frozen puff pastry, thawed
• 3 medium yellow onions (about 1 1/2 pounds; 680g) (see note)
• 4 tablespoons (2 ounces; 56g) unsalted butter, softened, divided
• Kosher salt and freshly ground black pepper
• 1 tablespoon (15ml) dry sherry (such as Amontillado)
• 3/4 cup (180ml) homemade chicken or beef stock, or store-bought, low-sodium chicken stock
• 1/4 teaspoon Asian fish sauce (optional)
• 1/4 teaspoon cider vinegar
• 1/2 teaspoon (2g) chopped fresh thyme leaves
• 1 tablespoon (15g) sugar
• 2 ounces (56g) Gruyère cheese, grated
• 2 tablespoons (30ml) Dijon mustard (optional)
• Freshly sliced chives, for garnish

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