Caramelized Onion and Gruyère Tart
Ready in 55 min. Dinner recipe. A rich, savory tart with sweet caramelized onions and melted cheese. Get step-by-step instructions, nutrition info, and tip
Instructions
Step 1
Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper.
Step 2
In a large skillet over medium heat, melt butter with olive oil. Add thinly sliced onions, sugar, and salt. Cook, stirring occasionally, for 20-25 minutes until onions are deeply golden brown and caramelized. Stir in thyme leaves during the last 2 minutes of cooking. Remove from heat and let cool slightly.
Step 3
Roll out puff pastry sheet on a lightly floured surface to about 10x12 inches. Transfer to the prepared baking sheet.
Step 4
Fold over about 1/2 inch of the pastry edges on all sides to create a border. Prick the center of the pastry with a fork several times to prevent puffing.
Step 5
In a bowl, mix caramelized onions with grated Gruyère cheese, heavy cream, and black pepper. Spread this mixture evenly over the center of the pastry, staying within the border.
Step 6
Brush the pastry border with beaten egg wash. Bake for 20-25 minutes, until pastry is golden brown and puffed, and cheese is melted and bubbly.
Step 7
Let tart cool for 5 minutes before slicing into 4 pieces. Serve warm.
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Nutrition Facts
Per serving
Approximate values based on standard ingredients
