Simple Homemade Caramelized Onion and Sage Tart

Ingredients

• •2 tablespoons olive oil
• •3 large onions, thinly sliced
• •1 tablespoon unsalted butter
• •1 tablespoon fresh sage leaves, chopped
• •1/2 teaspoon salt
• •1/4 teaspoon black pepper
• •1 sheet of puff pastry, thawed
• •1/2 cup grated Gruyère cheese
• •1 egg, lightly beaten (for egg wash)

Instructions

1. 1

   Preheat the oven to 400°F (200°C).

2. 2

   Heat olive oil in a large skillet over medium heat.

3. 3

   Add sliced onions and cook, stirring occasionally, for 20 minutes until softened and caramelized.

4. 4

   Add butter, chopped sage, salt, and black pepper to the onions and cook for another 2 minutes. Remove from heat and let cool slightly.

5. 5

   Roll out the puff pastry sheet on a floured surface and place it onto a parchment-lined baking sheet.

6. 6

   Spread the caramelized onion mixture evenly across the pastry, leaving a 1-inch border around the edges.

7. 7

   Sprinkle grated Gruyère cheese over the onions.

8. 8

   Fold the edges of the puff pastry inward to create a border, and brush the edges with the beaten egg.

9. 9

   Bake for 20 minutes or until the pastry is golden brown and puffed.

10. 10

    Allow the tart to cool for 5 minutes before slicing and serving.