Caramelised Onion Tart
This delightful caramelized onion tart is made with a buttery pastry base filled with sweet, golden-brown onions and topped with a creamy mixture of eggs and Gruyère cheese. The rich flavors and crisp pastry crust make this dish a savory treat perfect for any meal. Enjoy each bite of this flavorful and comforting tart!
— Constant Cookbook
Ingredients
- 500g all-butter shortcrust pastry
- 75g butter
- 3 large onions (about 600g), sliced
- 142ml pot double cream
- 3 eggs
- 100g Gruyère , grated
Instructions
- Finely slice the onions, then put them in a large, lidded pan with the oil and cook over a low heat for 30 mins, stirring from time to time.
- Remove the lid and turn up the heat, cooking the onions until they brown and caramelise, stirring often.
- Heat oven to 180C/160C fan/gas 4. Unroll the pastry and place on a greased baking sheet. Using a sharp knife, cut a 2cm border around the edge of the pastry, going almost but not quite through the pastry. Glaze the edge of the pastry with beaten egg.
- Spread the mustard over the base of the tart and pile on the onions, spreading them out to meet the edge. Mix the breadcrumbs, Parmesan and thyme leaves together, and sprinkle this topping evenly over the onions. Bake the tart for 18-20 mins or until the pastry is golden brown.
Yield
Serves 6
Nutrition
- Calories: 380 calories
- Fat Content: 22 grams fat
- Saturated Fat Content: 8 grams saturated fat
- Carbohydrate Content: 35 grams carbohydrates
- Sugar Content: 9 grams sugar
- Fiber Content: 3 grams fiber
- Protein Content: 9 grams protein
- Sodium Content: 1.2 milligram of sodium
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