These delicious tarts are fast and easy to make. They’re a scaled down version of an onion Tarte Tatin with caramelized onions, Gruyère cheese, balsamic, and thyme all baked in a flaky puff pastry until golden brown.
Prep: 20 mins • Cook: 20 mins • Total Time: 40 mins • Makes: 9 tarts
INGREDIENTS
- 1 sheet of puff pastry, thawed
- 4 Tbsp olive oil
- 4 Tbsp balsamic glaze
- 1 yellow onion, thinly sliced
- Fresh thyme leaves, salt, and black pepper, to taste
- 18 pieces thinly sliced Gruyère cheese, or as needed
- 1 egg, beaten
- 2 tablespoons honey, optional
Balsamic Glaze
- 1 cup balsamic vinegar
- 1/4 cup brown sugar
DIRECTIONS
- Make the balsamic glaze: Mix the vinegar and sugar in a small pan over a low heat and simmer for 4-6 mins until thickened and glossy. Leave to cool (it will thicken as it cools).
- Preheat oven to 400°F (200°C) and line a baking sheet with parchment paper.
- Cut the thawed puff pastry into 9 equal rectangles.
- Drizzle oil equally on the baking sheet to make 9 small puddles. Drizzle on balsamic glaze. Top each puddle with an onion slice. Sprinkle on thyme leaves, salt, and pepper. Top with a slices of Gruyère cheese.
- Place a puff pastry rectangle on top of each onion and cheese stack.
- Brush the top of each puff pastry tart with beaten egg wash. Bake for approximately 20 minutes, or until the tarts are nicely browned and puffed.
- Remove the tarts from the oven and carefully flip each one over using a spatula. Drizzle honey, optional, over each tart and sprinkle with fresh thyme leaves. Allow the tarts to cool slightly before serving. They are best enjoyed warm.
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