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Upside Down Onion Tart

Savory Upside Down Onion Tart for Effortless Elegance

This Upside Down Onion Tart transforms humble ingredients into an indulgent, vegetarian dish, perfect for gatherings.
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Prep Time 15 minutes
Cook Time 30 minutes
Cooling Time 5 minutes
Total Time 50 minutes
Servings: 6 slices
Course: Dinner
Cuisine: Italian
Calories: 250
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Tart
  • 4 medium Onions Can substitute with leeks or other sweet onions.
  • 1 sheet Puff Pastry Thawed before use.
  • 2 tablespoons Olive Oil Can substitute with butter.
  • 1 tablespoon Butter Optional; skip for dairy-free.
  • to taste Salt Adjust to your taste.
  • to taste Sugar Optional; reduce or omit for less sweetness.
  • 1 cup Cheese (e.g., Gruyère or Cheddar) Any melting cheese can be used.
  • to taste Balsamic Glaze Optional, for drizzling.

Equipment

  • Baking Dish
  • large skillet

Method
 

Step-by-Step Instructions
  1. Preheat your oven to 400°F (200°C) and prepare a greased baking dish.
  2. Thinly slice the onions to ensure even cooking.
  3. Sauté onions in a mixture of olive oil and butter with salt and sugar for 20–25 minutes until golden brown.
  4. Spread the caramelized onions in the baking dish, sprinkle cheese on top, and layer with the puff pastry.
  5. Bake for 25–30 minutes until the pastry is golden brown.
  6. Cool for 5 minutes before inverting onto a plate to serve.

Nutrition

Serving: 1sliceCalories: 250kcalCarbohydrates: 30gProtein: 6gFat: 12gSaturated Fat: 6gPolyunsaturated Fat: 0.5gMonounsaturated Fat: 5gCholesterol: 20mgSodium: 200mgPotassium: 150mgFiber: 2gSugar: 3gVitamin A: 600IUVitamin C: 5mgCalcium: 100mgIron: 1mg

Notes

Use high-quality ingredients for the best flavor. You can customize the tart by adding herbs or different cheeses.

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