French Onion Soup Tarte Tatin Recipe

Ingredients For French Onion Soup Tarte Tatin Recipe

• 0.5 Batch old fashioned flaky pie dough or 1 sheet frozen puff pastry, thawed
• 3 Medium yellow onions
• 4 tablespoon Unsalted butter, softened, divided
• Kosher Salt And Freshly Ground Black Pepper
• 1 tablespoon Dry sherry
• 0.75 cup Homemade chicken or beef stock, or store bought, low sodium chicken stock
• 0.25 teaspoon Asian Fish Sauce
• 0.25 teaspoon Cider vinegar
• 0.5 teaspoon Chopped fresh thyme leaves
• 1 tablespoon Sugar
• 2 ounce Gruya re cheese, grated
• 2 tablespoon Dijon mustard