This tart features a buttery pastry base topped with caramelised onions and creamy goat’s cheese. It’s an indulgent combination of sweet and savory flavors with a flaky crust, making it a versatile dish for any occasion.
Preheat your oven to 200°C (400°F). Line a baking tray with parchment paper.
Heat the butter and olive oil in a large frying pan over medium heat. Add the sliced onions and cook for 10-15 minutes, stirring occasionally, until softened and golden brown. Stir in the brown sugar and balsamic vinegar, cooking for another 5 minutes until the onions are caramelised. Season with salt and black pepper and set aside to cool slightly.
Roll out the puff pastry (if needed) and place it on the prepared baking tray. Using a knife, score a 1-inch border around the edges without cutting all the way through. Prick the center with a fork to prevent it from puffing up too much.
Spread the caramelised onions evenly over the center of the puff pastry, staying within the scored border. Top with sliced or crumbled goat’s cheese and sprinkle with fresh thyme leaves.
Brush the edges of the puff pastry with the beaten egg. Bake in the preheated oven for 20-25 minutes, or until the pastry is golden and puffed, and the cheese is slightly melted.
Let the tart cool slightly before slicing. Serve warm or at room temperature with a side salad or as part of a larger spread.