🍳 Method Overview
Caramelize the Onions
Sauté onion slices in olive oil until golden and tender.
Add balsamic vinegar, salt, pepper, and thyme. Cook until glossy and fragrant.
Layer in Pan
Grease a round baking dish or skillet with butter.
Arrange caramelized onions in a single layer.
Top with Pastry
Roll out puff pastry and lay it over the onions, tucking edges inside the pan.
Bake
Bake at 375°F (190°C) for 25–30 minutes until pastry is golden and puffed.
Invert and Serve
Let cool slightly, then flip onto a serving plate to reveal the caramelized onion topping.
Garnish with fresh herbs or a drizzle of balsamic glaze.
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